Sforza Castle

In Sforza Castle—Italian Castello Sforzesco—you’re looking at a complex that began as a Visconti fortification and later became a stage for Renaissance ambition and artistic experiment. The story is unusually dramatic because the castle was repeatedly remade by whoever held Milan: built, destroyed, reconstructed, militarized, and eventually re-purposed for public culture.

From Visconti fortress to princely court

The earliest phase was ordered by Galeazzo II Visconti, a local nobleman, in 1358, continuing to about c. 1370. It was known as the Castello di Porta Giova—or Porta Zubia—after a nearby gate, in the same zone as the former Roman complex of Castrum Portae Jovis. When Milan’s Visconti heirs expanded it, the fortress developed into a square-plan stronghold with 200 m-long sides, four corner towers, and walls up to 7 metres thick. That enlargement proceeded under Gian Galeazzo, Giovanni Maria, and Filippo Maria Visconti, and the castle served as the main residence of the Visconti lords. Then came a hard break: it was destroyed by the short-lived Golden Ambrosian Republic, which expelled the Visconti in 1447. In 1450, after Francesco Sforza shattered the republicans, he began reconstruction to convert the fortress into a princely residence.