Galeazzo Maria Sforza was born in Fermo, near the family's castle of Girifalco, the first son of Francesco Sforza and Bianca Maria Visconti. At the death of his father (8 March 1466), Galeazzo was in France at the head of a military expedition to help King Louis XI of France against Charles I of Burgundy .
In 1385, Gian Galeazzo Visconti, son of Galeazzo II, staged a coup against his uncle Bernabò, arrested him, and took control of all the Visconti territories. Gian Galeazzo chose the Trezzo castle as the place of imprisonment for Bernabò. A few months later, Bernabò died in his cell, supposedly after having been poisoned.
- 42 m (138 ft) (tower)
- Municipality of Trezzo sull'Adda
- Medieval castle
Gian Galeazzo Visconti (16 October 1351 – 3 September 1402), was the first duke of Milan (1395) and ruled the late-medieval city just before the dawn of the Renaissance. He was the founding patron of the Certosa di Pavia , completing the Visconti Castle at Pavia begun by his father and furthering work on the Duomo of Milan .
The Visconti and the Sforza The medieval Castle of Porta Giovia was enlarged by its successors: Gian Galeazzo Visconti, who became the first Duke of Milan, Giovanni Maria and Filippo Maria, who first moved the courtyard from the ducal palace that stood near the Cathedral (today’s Royal Palace).
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Sep 17, 2018 · Gian Galeazzo was born in Fermo, near the family's castle of Girifalco, the first son of Francesco Sforza and Bianca Maria Visconti. At the death of his father (March 8, 1466), Gian Galeazzo was in France at the head of a military expedition to help King Louis XI of France against Charles I of Burgundy.
- Bianca Maria Sforza, Caterina Sforza, Gian Galeazzo Sforza
- Francesco I Sforza, Bianca Maria Visconti
Caradosso (attr.), Medal of Gian Giacomo Trivulzio, 1499 Zanetto Bugatto (attr.), Portrait of Galeazzo Maria Sforza, 1474-1476 Lombard painter, Bona di Savoia presented by a holy martyr, 1471-72
The castle used to be the main residence of the Visconti family, while the political capital of the state was Milan. North of the castle a wide park was enclosed, also including the Certosa of Pavia , founded 1396 according to a vow of Gian Galeazzo Visconti , meant to be a sort of private chapel of the Visconti dynasty.
The three sons of Gian Galeazzo and Isabelle died before reaching adulthood. Gian Galeazzo and Caterina had two sons: Giovanni Maria in 1388 and Filippo Maria in 1392. In 1395 Gian Galeazzo obtained from the Emperor Wenceslaus IV of Bohemia, for the price of 100,000 florins, the title of Duke of Milan. During the years of his rule, the Visconti ...
Gian Galeazzo Sforza with his uncle and regent Ludovico Sforza Despite this early warmth between the cousins, their relationship suffered due to Ludovico's political schemes. The birth of Beatrice's son, Maximilian , was greeted by great pomp and ceremony, befitting an heir, something that had been denied to Isabella's son. 
On the death of Gian Galeazzo Sforza, Ludovico's usurpation was legalized, and after the Battle of Fornovo (1495), both he and his wife took part in the peace congress of Vercelli between Charles VIII of France and the Italian princes, at which Beatrice showed great political ability.