Anthemius of Tralles (ca. 474 – ca. 534):
a professor of geometry and architecture, authored many influential works on mathematics and was one of the architects of the famed Hagia Sophia, the largest building in the world at its time. His works were among the most important source texts in the Arab world and Western Europe for centuries after.
John Philoponus (ca. 490–ca. 570):
also known as John the Grammarian, a Christian Byzantine philosopher, launched a revolution in the understanding of physics by critiquing and correcting the earlier works of Aristotle. In the process he proposed important concepts such as a rudimentary notion of inertia and the invariant acceleration of falling objects. Although his works were repressed at various times in the Byzantine Empire, because of religious controversy, they would nevertheless become important to the understanding of physics throughout Europe and the Arab world.
Paul of Aegina (ca. 625–ca. 690):
considered by some to be the greatest Christian Byzantine surgeon, developed many novel surgical techniques and authored the medical encyclopedia Medical Compendium in Seven Books. The book on surgery in particular was the definitive treatise in Europe and the Islamic world for hundreds of years.
The Venerable Bede (ca. 672–735):
a Christian monk of the monasteries of Wearmouth and Jarrow who wrote a work On the Nature of Things, several books on the mathematical / astronomical subject of computus, the most influential entitled On the Reckoning of Time. He made original discoveries concerning the nature of the tides and his works on computus became required elements of the training of clergy, and thus greatly influenced early medieval knowledge of the natural world.
Rabanus Maurus (c. 780 – 856):
a Christian monk and teacher, later archbishop of Mainz, who wrote a treatise on Computus and the encyclopedic work De universo. His teaching earned him the accolade of "Praeceptor Germaniae," or "the teacher of Germany."
Abbas Ibn Firnas (810 – 887):
a polymath and inventor in Muslim Spain, made contributions in a variety of fields and is most known for his contributions to glass-making and aviation. He developed novel ways of manufacturing and using glass. He broke his back at an unsuccessful attempt at flying a primitive hang glider in 875.
Pope Sylvester II (c. 946–1003):
a Christian scholar, teacher, mathematician, and later pope, reintroduced the abacus and armillary sphere to Western Europe after they had been lost for centuries following the Greco-Roman era. He was also responsible in part for the spread of the Hindu-Arabic numeral system in Western Europe.
Maslamah al-Majriti (died 1008):
a mathematician, astronomer, and chemist in Muslim Spain, made contributions in many areas, from new techniques for surveying to updating and improving the astronomical tables of al-Khwarizmi and inventing a process for producing mercury oxide. He is most famous, though, for having helped transmit knowledge of mathematics and astronomy to Muslim Spain and Christian Western Europe.
a physician and scientist in Muslim Spain, is considered to be the father of modern surgery. He wrote numerous medical texts, developed many innovative surgical instruments, and developed a variety of new surgical techniques and practices. His texts were considered the definitive works on surgery in Europe until the Renaissance.
Constantine the African (c. 1020&–1087):
a Christian native of Carthage, is best known for his translating of ancient Greek and Roman medical texts from Arabic into Latin while working at the Schola Medica Salernitana in Salerno, Italy. Among the works he translated were those of Hippocrates and Galen.
the foremost astronomer of the early second millennium, lived in Muslim Spain and greatly expanded the understanding and accuracy of planetary models and terrestrial measurements used for navigation. He developed key technologies including the equatorium and universal latitude-independent astrolabe.
Avempace (died 1138):
a famous physicist from Muslim Spain who had an important influence on later physicists such as Galileo. He was the first to theorize the concept of a reaction force for every force exerted.
Adelard of Bath (c. 1080 – c. 1152):
was a 12th-century English scholar, known for his work in astronomy, astrology, philosophy and mathematics.
from Muslim Spain, introduced an experimental method in surgery, employing animal testing in order to experiment with surgical procedures before applying them to human patients. He also performed the earliest dissections and postmortem autopsies on both humans as well as animals.
Robert Grosseteste (1168–1253):
Bishop of Lincoln, was the central character of the English intellectual movement in the first half of the 13th century and is considered the founder of scientific thought in Oxford. He had a great interest in the natural world and wrote texts on the mathematical sciences of optics, astronomy and geometry. In his commentaries on Aristotle's scientific works, he affirmed that experiments should be used in order to verify a theory, testing its consequences. Roger Bacon was influenced by his work on optics and astronomy.
Albert the Great (1193–1280):
Doctor Universalis, was one of the most prominent representatives of the philosophical tradition emerging from the Dominican Order. He is one of the thirty-three Saints of the Roman Catholic Church honored with the title of Doctor of the Church. He became famous for his vast knowledge and for his defence of the pacific coexistence between science and religion. Albert was an essential figure in introducing Greek and Islamic science into the medieval universities, although not without hesitation with regard to particular Aristotelian theses. In one of his most famous sayings he asserted: "Science does not consist in ratifying what others say, but of searching for the causes of phenomena." Thomas Aquinas was his most famous pupil.
John of Sacrobosco (c. 1195 – c. 1256):
was a scholar, monk, and astronomer (probably English, but possibly Irish or Scottish) who taught at the University of Paris and wrote an authoritative and influential mediaeval astronomy text, the Tractatus de Sphaera; the Algorismus, which introduced calculations with Hindu-Arabic numerals into the European university curriculum; the Compotus ecclesiasticis on Easter reckoning; and the Tractatus de quadrante on the construction and use of the astronomical quadrant.
Jordanus de Nemore (late 12th, early 13th century):
was one of the major pure mathematicians of the Middle Ages. He wrote treatises on mechanics ("the science of weights"), on basic and advanced arithmetic, on algebra, on geometry, and on the mathematics of stereographic projection.
Villard de Honnecourt (fl. 13th century):
a French engineer and architect who made sketches of mechanical devices such as automatons and perhaps drew a picture of an early escapement mechanism for clockworks.
Roger Bacon (1214–94):
Doctor Admirabilis, joined the Franciscan Order around 1240 where, influenced by Grosseteste, Alhacen and others, he dedicated himself to studies where he implemented the observation of nature and experimentation as the foundation of natural knowledge. Bacon wrote in such areas as mechanics, astronomy, geography and, most of all, optics. The optical research of Grosseteste and Bacon established optics as an area of study at the medieval university and formed the basis for a continuous tradition of research into optics that went all the way up to the beginning of the 17th century and the foundation of modern optics by Kepler.
Ibn al-Baitar (died 1248):
a botanist and pharmacist in Muslim Spain, researched over 1400 types of plants, foods, and drugs and compiled pharmaceutical and medical encyclopedias documenting his research. These were used in the Islamic world and Europe until the 19th century.
Theodoric Borgognoni (1205-1296):
was an Italian Dominican friar and Bishop of Cervia who promoted the uses of both antiseptics and anaesthetics in surgery. His written work had a deep impact on Henri de Mondeville, who studied under him while living in Italy and later became the court physician for King Philip IV of France.
William of Saliceto (1210-1277):
was an Italian surgeon of Lombardy who advanced medical knowledge and even challenged the work of the renowned Greco-Roman surgeon Galen (129-216 AD) by arguing that allowing pus to form in wounds was detrimental to the health of he patient.
Thomas Aquinas (1227–74):
Doctor Angelicus, was an Italian theologian and friar in the Dominican Order. As his mentor Albert the Great, he is a Catholic Saint and Doctor of the Church. In addition to his extensive commentaries on Aristotle's scientific treatises, he was also said to have written an important alchemical treatise titled Aurora Consurgens. However, his most lasting contribution to the scientific development of the period was his role in the incorporation of Aristotelianism into the Scholastic tradition.
Arnaldus de Villa Nova (1235-1313):
was an alchemist, astrologer, and physician from the Crown of Aragon who translated various Arabic medical texts, including those of Avicenna, and performed optical experiments with camera obscura.
John Duns Scotus (1266–1308):
Doctor Subtilis, was a member of the Franciscan Order, philosopher and theologian. Emerging from the academic environment of the University of Oxford. where the presence of Grosseteste and Bacon was still palpable, he had a different view on the relationship between reason and faith as that of Thomas Aquinas. For Duns Scotus, the truths of faith could not be comprehended through the use of reason. Philosophy, hence, should not be a servant to theology, but act independently. He was the mentor of one of the greatest names of philosophy in the Middle Ages: William of Ockham.
Mondino de Liuzzi (c. 1270-1326):
was an Italian physician, surgeon, and anatomist from Bologna who was one of the first in Medieval Europe to advocate for the public dissection of cadavers for advancing the field of anatomy. This followed a long-held Christian ban on dissections performed by the Alexandrian school in the late Roman Empire.
William of Ockham (1285–1350):
Doctor Invincibilis, was an English Franciscan friar, philosopher, logician and theologian. Ockham defended the principle of parsimony, which could already be seen in the works of his mentor Duns Scotus. His principle later became known as Occam's Razor and states that if there are various equally valid explanations for a fact, then the simplest one should be chosen. This became a foundation of what would come to be known as the scientific method and one of the pillars of reductionism in science. Ockham probably died of the Black Plague. Jean Buridan and Nicole Oresme were his followers.
Jacopo Dondi dell'Orologio (1290-1359):
was an Italian doctor, clockmaker, and astronomer from Padua who wrote on a number of scientific subjects such as pharmacology, surgery, astrology, and natural sciences. He also designed an astronomical clock.
Richard of Wallingford (1292-1336):
an English abbot, mathematician, astronomer, and horologist who designed an astronomical clock as well as an equatorium to calculate the lunar, solar and planetary longitudes, as well as predict eclipses.
Jean Buridan (1300–58):
was a French philosopher and priest. Although he was one of the most famous and influent philosophers of the late Middle Ages, his work today is not renowned by people other than philosophers and historians. One of his most significant contributions to science was the development of the theory of impetus, that explained the movement of projectiles and objects in free-fall. This theory gave way to the dynamics of Galileo Galilei and for Isaac Newton's famous principle of Inertia.
Guy de Chauliac (1300-1368):
was a French physician and surgeon who wrote the Chirurgia magna, a widely read publication throughout medieval Europe that became one of the standard textbooks for medical knowledge for the next three centuries. During the Black Death he clearly distinguished Bubonic Plague and Pneumonic Plague as separate diseases, that they were contagious from person to person, and offered advice such as quarantine to avoid their spread in the population. He also served as the personal physician for three successive popes of the Avignon Papacy.
John Arderne (1307-1392):
was an English physician and surgeon who invented his own anesthetic that combined hemlock, henbane, and opium. In his writings, he also described how to properly excise and remove the abscess caused by anal fistula.
Nicole Oresme (c. 1323–82):
was one of the most original thinkers of the 14th century. A theologian and bishop of Lisieux, he wrote influential treatises in both Latin and French on mathematics, physics, astronomy, and economics. In addition to these contributions, Oresme strongly opposed astrology and speculated about the possibility of a plurality of worlds.
Giovanni Dondi dell'Orologio (c. 1330-1388):
was a clockmaker from Padua, Italy who designed the astarium, an astronomical clock and planetarium that utilized the escapement mechanism that had been recently invented in Europe. He also attempted to describe the mechanics of the solar system with mathematical precision.
According to tradition, Saint Expeditus was a Roman centurion in Armenia who became a Christian and was beheaded during the Diocletian Persecution in 303 A.D. The day he decided to become a Christian, the Devil took the form of a crow and told him to defer his conversion until the next day. Expeditus stamped on the bird and killed it, declaring, “I shall be a Christian today!”
Saint Valentine is a widely recognized third-century Roman saint commemorated on February 14 and since the High Middle Ages is associated with a tradition of courtly love.
All that is reliably known of the saint commemorated on February 14 is his name and that he was martyred and buried at a cemetery on the Via Flaminia close to the Ponte Milvio to the north of Rome on that day. It is uncertain whether St. Valentine is to be identified as one saint or the conflation of two saints of the same name. Several different martyrologies have been added to later hagiographies that are unreliable.
Because so little is reliably known of him, in 1969 the Catholic Church removed his name from the General Roman Calendar, leaving his liturgical celebration to local calendars. The Roman Catholic Church continues to recognize him as a saint, listing him as such in the February 14 entry in the Roman Martyrology and authorising liturgical veneration of him on February 14 in any place where that day is not devoted to some other obligatory celebration in accordance with the rule that on such a day the Mass may be that of any saint listed in the Martyrology for that day. Saint Valentine’s Church in Rome, built in 1960 for the needs of the Olympic Village, continues as a modern, well-visited parish church.
Father Frank O’Gara of Whitefriars Street Church in Dublin, Ireland, tells the story of the man behind the holiday—St. Valentine.
“He was a Roman Priest at a time when there was an emperor called Claudias who persecuted the church at that particular time,” Father O’Gara explains. ” He also had an edict that prohibited the marriage of young people. This was based on the hypothesis that unmarried soldiers fought better than married soldiers because married soldiers might be afraid of what might happen to them or their wives or families if they died.”
“I think we must bear in mind that it was a very permissive society in which Valentine lived,” says Father O’Gara. “Polygamy would have been much more popular than just one woman and one man living together. And yet some of them seemed to be attracted to Christian faith. But obviously the church thought that marriage was very sacred between one man and one woman for their life and that it was to be encouraged. And so it immediately presented the problem to the Christian church of what to do about this.”
“The idea of encouraging them to marry within the Christian church was what Valentine was about. And he secretly married them because of the edict.”
Valentine was eventually caught, imprisoned and tortured for performing marriage ceremonies against command of Emperor Claudius the second. There are legends surrounding Valentine’s actions while in prison.
“One of the men who was to judge him in line with the Roman law at the time was a man called Asterius, whose daughter was blind. He was supposed to have prayed with and healed the young girl with such astonishing effect that Asterius himself became Christian as a result.”
In the year 269 AD, Valentine was sentenced to a three part execution of a beating, stoning, and finally decapitation all because of his stand for Christian marriage. The story goes that the last words he wrote were in a note to Asterius’ daughter. He inspired today’s romantic missives by signing it, “from your Valentine.”
“What Valentine means to me as a priest,” explains Father O’Gara, “is that there comes a time where you have to lay your life upon the line for what you believe. And with the power of the Holy Spirit we can do that —even to the point of death.”
Valentine’s martyrdom has not gone unnoticed by the general public. In fact, Whitefriars Street Church is one of three churches that claim to house the remains of Valentine. Today, many people make the pilgrimage to the church to honour the courage and memory of this Christian saint. Below is the Shrine of St Valentine in Whitefriar Street, Carmelite Church in Dublin, Ireland.
Above: Salvador Dalí painting St. John of the Cross
Photo: Daniel Farson
From Wiki: “Christ of Saint John of the Cross is a painting by Salvador Dalí made in 1951. It depicts Jesus Christ on the cross in a darkened sky floating over a body of water complete with a boat and fishermen. Although it is a depiction of the crucifixion, it is devoid of nails, blood, and a crown of thorns, because, according to Dalí, he was convinced by a dream that these features would mar his depiction of Christ. Also in a dream, the importance of depicting Christ in the extreme angle evident in the painting was revealed to him.
The painting is known as the Christ of Saint John of the Cross, because its design is based on a drawing by the 16th-century Spanish friar John of the Cross. The composition of Christ is also based on a triangle and circle (the triangle is formed by Christ’s arms; the circle is formed by Christ’s head). The triangle, since it has three sides, can be seen as a reference to the Trinity, and the circle may be an allusion to Platonic thought. The circle represents Unity: all things do exist in the "three” but in the four, merry they be.
On the bottom of his studies for the painting, Dalí explained its inspiration: “In the first place, in 1950, I had a ‘cosmic dream’ in which I saw this image in colour and which in my dream represented the 'nucleus of the atom.’ This nucleus later took on a metaphysical sense; I considered it 'the very unity of the universe,’ the Christ!”
In order to create the figure of Christ, Dalí had Hollywood stuntman Russell Saunders suspended from an overhead gantry, so he could see how the body would appear from the desired angle and also envisage the pull of gravity on the human body. The depicted body of water is the bay of Port Lligat, Dalí’s residence at the time of the painting.“ (via: wiki)
Above: A preparatory drawing for Christ of St. John of the Cross (Christ On The Cross From Top Perspective)
Above: The sketch that inspired Dalí. Crucifixion by St. John of the Cross, c. 1550
Saint John of the Cross had a vision while praying. The vision led to the drawing of Christ from above.
Saint John of the Cross (born Juan de Yepes y Álvarez) (1542– 14 December 1591) was a Spanish mystic, a Roman Catholic saint, a Carmelite friar.
Above: Dali painting St. John of the Cross - Photo: by Daniel Farson
Christ of St. John of the Cross, 1951, Kelvingrove Art Gallery and Museum, Glasgow - Salvador Dali