Pietro IV Candiano

Pietro IV Candiano (died 976) was the twenty-second (traditional) or twentieth (historical) Doge of Venice from 959 to his death. He was the eldest son of Pietro III Candiano, with whom he co-reigned and whom he was elected to succeed.

By associating his son with him in the dogeship, Pietro III was trying to establish a hereditary monarchy in Venice. This incurred the wrath of the people, who, in a popular assembly, tried to kill the doge. Pietro IV intervened to save his father's life and exiled him with a small group of followers to Ivrea, where the Margrave Guy took him to his father, the king of Italy, Berengar II.

Pietro III then participated with Guy in an expedition against Theobald II, Duke of Spoleto, and gained the support of Berengar for an assault on Venice. At the head of a band of partisans, Pietro IV defeated his father, but did not kill him. He was then elected sole doge.

One of his first acts as doge was the blinding and expulsion of the Bishop of Castello, accused of simony. In June 960, he reconvened the popular assembly and had them approve of a law prohibiting the slave trade.

For political reasons, Pietro repudiated his first wife, Joan, forcing her into the convent of Santa Zaccaria. He had had two children through her: his son Vitale was later elected doge and his daughter Marina was married to Tribuno Memmo, a future doge. In 966, Pietro remarried to the Lombard Waldrada of Tuscany, daughter of Hubert, Duke of Spoleto, and a relative of the Emperor Otto I. As a relative also of the king of Italy, Waldrada brought him a large dowry including the possession of Treviso, Friuli, and Ferrara.

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