Byzantion and Constantinopolis were reborn under a third name. This name - the one that the great city still bears - betrays its timeless status as metropolis. What is the origin of ‘Istanbul’? It is the medieval Greek peasant’s answer to the typical question posed by a stranger anywhere near Constantinople. 'Where does this road go? Where can I buy food and wine? Where will I find lodging tonight? The answer was is tin boli, 'to the City, at the City’. This was, without rival, 'the City’.
— Flavours of Byzantium, Andrew Dalby