Gian Galeazzo Sforza (20 June 1469 – 21 October 1494), also known as Giovan Galeazzo Sforza, was the sixth Duke of Milan. He was the father of Bona Maria Sforza, who later became Queen of Poland. He died in 1494 aged 25 and was succeeded by his uncle, Ludovico Sforza.
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Early life
Born in Abbiategrasso, Gian Galeazzo was son of Galeazzo Maria Sforza and Bona of Savoy. He was only seven years old when in 1476 his father, Galeazzo Maria, was assassinated and he became the Duke of Milan. His uncle, Ludovico Sforza, acted as regent to the young duke, but quickly wrested all power from him and became the de facto ruler of Milan. Ludovico imprisoned Gian Galeazzo and later became the duke after Gian Galeazzo's death, which was widely viewed as suspicious.
Marriage and issue
In February 1489, Gian Galeazzo married his cousin Isabella of Naples-Aragon.
They had:
Francesco Maria Sforza (1491–1512), Count of Pavia;
Ippolita Maria Sforza (1493–1501);
Bona Maria Sforza (1494–1557). Only surviving child, she married Sigismund I the Old, with issue.