Andrew III of Hungary

Andrew III the Venetian was King of Hungary and Croatia between 1290 and 1301. His father, Stephen the Posthumous, was the posthumous son of Andrew II of Hungary although Stephens brothers considered him a bastard. Andrew grew up in Venice, and first arrived in Hungary upon the invitation of a rebellious baron, Ivan Kszegi, in 1278. Kszegi tried to play Andrew off against Ladislaus IV of Hungary, but the conspiracy collapsed and Andrew returned to Venice.

Andrew was the son of Stephen the Posthumous, the selfstyled Duke of Slavonia, and his second wife, Tomasina Morosini. Andrews father was born to Beatrice DEste, the third wife of Andrew II of Hungary, after the kings death. However, Andrew IIs two elder sons, Bla IV of Hungary and Coloman of Halych, accused Beatrice DEste of adultery and refused to acknowledge Stephen the Posthumous as their legitimate brother. Andrews mother, Tomasina Morosini, was the daughter of wealthy Venetian patrician Michele Morosini.

Source: Wikipedia