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Barbara Edelpöck was a daughter of Hans Edelpöck, a citizen of Stein (now Krems an der Donau) in Lower Austria.[3][4] Matthias Corvinus King of Hungary and Bohemia met Barbara Edelpöck during the 1470 Vienna Summit, where Frederick III, Holy Roman Emperor organized dance parties.[5] Matthias took her with him to Buda. On 2 April 2 1473, their child, John Corvinus was born in Buda, whom Barbara began to raise in Besztercebánya in a house given by King Matthias until 1476. In 1476, Matthias married Beatrice of Aragon, and after they had no children, in 1479 he recognized John Corvinus as his legitimate son.

https://en.wikipedia.org/wiki/Barbara_Edelp%C3%B6ck