Britannica Sources used in this answer

When did Gian Galeazzo Visconti become duke of Milan?

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People walk and shop inside the ornate Galleria Vittorio Emanuele II in Milan, Italy, with its glass-domed roof, decorative mosaics, and luxury store entrances. — Milan Shoppers in the Galleria Vittorio Emanuele II, Milan.

Gian Galeazzo Visconti became the duke of Milan in 1395. He received this title from the German king Wenceslas in exchange for a large bribe, establishing him as a hereditary prince of the Holy Roman Empire.12