Charles Constantine of Vienne
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Charles-Constantine (d.962) was the count of Vienne, son of Louis the Blind, king of Provence and Holy Roman Emperor.
Some scholars allege that his mother was Anna of Constantinople, daughter of Leo VI the Wise and his second wife Zoe Zaoutzaina. However Louis's marriage to this princess is much disputed and is rather unlikely. Christian Settipani postulates that his name refers to the founders of the empires governed by his father and maternal grandfather, i.e., to Charlemagne and Constantine the Great.
When Louis died in 929, Hugh of Arles, who was already king of Italy, took over Provence and gave it, in 933, to King Rudolf II of Burgundy. Charles-Constantine relinquished his claim to the throne without much argument and this has led many to believe he was, in fact, a bastard. He was compensated with the county of the Viennois, which he ruled until his death in 962.
He was married to Thiberge de Troyes. Their daughter Constance of Vienne was wife to Boso II of Provence and ancestor of the Counts of Provence.