Gian Galeazzo Sforza was the sixth Duke of Milan from 1476 until his death in 1494. Born on June 20, 1469, he was the eldest son of Galeazzo Maria Sforza and Bona of Savoy.
Gian Galeazzo was only seven years old when his father, Galeazzo Maria Sforza, was assassinated on December 26, 1476. Following the assassination, his uncle Ludovico Sforza, also known as Ludovico il Moro, became regent of Milan. During his regency, Ludovico wielded significant power and influence over the duchy, often acting more like the ruler than the young Gian Galeazzo.
In 1489, to secure political alliances, Gian Galeazzo was married to Isabella of Aragon, the daughter of Alfonso II of Naples. This union was part of Ludovico's strategy to consolidate power and ensure his position in Milan. However, Ludovico's influence remained unchallenged, and he effectively governed Milan, overshadowing his nephew's role.
Gian Galeazzo was described as weak in health and character, which allowed Ludovico to maintain control over the duchy. His rule was nominal, with Ludovico making most of the significant decisions. Gian Galeazzo's lack of personal power is often highlighted as a key factor in the political dynamics of Milan during this period.
Gian Galeazzo Sforza died on October 21, 1494, at the age of 25, officially from gout, though there were rumors of poisoning. His death marked a significant turning point for Milan, as Ludovico Sforza officially assumed the title of Duke. Gian Galeazzo left no legitimate children, though he had an illegitimate son, Carlo Sforza.
His reign, although marked by his uncle's control, was a period of cultural flourishing in Milan, with significant patronage of the arts, especially by Ludovico. The death of Gian Galeazzo led to increased tension and eventually the French invasion of Italy, as Charles VIII of France sought to claim the Kingdom of Naples, leading to the Italian Wars.