Overview
Giovanni Visconti (1290–1354) was an Italian Roman Catholic cardinal, who was co-ruler in Milan and lord of other Italian cities. He also was a military leader who fought against Florence, and used force to capture and hold other cities.
Biography
He was the son of Matteo I Visconti and Bonacossa Borri.
Giovanni Visconti was elected archbishop by the Capitol of Milan in 1317, but Pope John XXII refused to confirm the election and instead raised Aicardus from Comodeia to that position. In 1323 John excommunicated him with an accusation of heresy, and Visconti found an ally in the antipope Nicholas V, who give him the title of cardinal. In 1331 he became bishop and lord of Novara, and in 1339, after Aicardus' death, he triumphantly entered Milan, although Pope Clement VI only issued a bull confirming him in the archbishopric in 1342. Officially, he was Archbishop of Milan from 1342 to 1354.
Together with his brother Luchino, Visconti bought from the Pope the title of co-ruler of Milan, for 500,000 florins. After Luchino's death, he associated in the lordship the sons of his other brother, Stefano, who were Matteo II, Bernabò and Galeazzo II.
From Wikipedia (CC BY-SA 4.0).