The Hungarian diet had elected infant John Sigismund Zápolya, the son of Zápolya and Isabella Jagiellon, as King of Hungary, which broke the Treaty of Nagyvárad, and Ferdinand I invaded Hungary.
Dieta ungară a ales copilul John Sigismund Zápolya, fiul lui Zápolya și Isabella Jagiellon, rege al Ungariei, care a încălcat Tratatul de la Nagyvárad, iar Ferdinand I a invadat Ungaria.