"Our knowledge about Finnish mythology comes mainly from Kalevala (The Finnish National Epic), and some oral traditions. Kalevala is composed of a set of poems collected by Elias Lönnrot in the 19th century.
It contains something from Viking adventurers, stone age myths, Christian influences, and country folklore. Kalevala was basically oral before Lönnrot, so it is not an original work, even if the poems may seem original themselves.” X
From Wiki: Akseli Gallen-Kallela (26 April 1865 – 7 March 1931) was a Swedish-speaking Finnish painter who is best known for his illustrations of the Kalevala, the Finnish national epic… His work was considered very important for the Finnish national identity. He changed his name from Gallen to Gallen-Kallela in 1907.”
Akseli Gallen-Kallela "Kullervo departs for the war", (1901)
In the Finnish Kalevala Kullervo was the ill-fated son of Kalervo. He is the only irredeemably tragic character in Finnish mythology. The story of Kullervo is laid out in runes (chapters) 31 through 36 of the Kalevala.