THE CASTLE REBUILT
Three years later, in 1450, general Francesco Sforza, a great leader who had married Bianca Maria Visconti, Filippo Maria's illegitimate child and sole heir, became Duke of Milan. The Castle was rebuilt upon the ancient foundations of the Visconti Castle. The new fortress appeared more refined thanks to the Filarete tower, which was placed at the entrance, and to the great round towers designed by architect Bartolomeo Gadio.
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