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The first war between Matthias I Corvinus, king of Hungary, and Holy Roman Emperor Frederick III started in 1459 as a result of Frederick’s desire to enforce his claims to the Hungarian throne. The clash ended with the Treaty of Wiener Neustadt of 1463-1464, which confirmed the Habsburg claims to Hungary in the event that Matthias should die without an heir. Subsequent relations between the two monarchs seemed friendly: Frederick even asked Matthias for help against the heretical Czechs in 1467. The friendship, however, was short-lived. Matthias supported the uprising of Andreas Baumkircher, a nobleman from Styria, against the emperor (1469-1470), while Frederick refused to cede the title of king of Hungary, which he had held since 1459. Frederick and Matthias, then, each believed himself to have legitimate grievances against the other. They broke openly in 1470, at their meeting in Vienna.