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From Wikipedia
Charles-Constantine (died 962) was the Count of Vienne, son of Louis the Blind, King of Provence, and the Holy Roman Emperor.
Name and maternity
About his name; he was never called "Charles Constantine", rather Flodoard, copied later by Richar, calls him "Constantinus". We know that his proper name was "Carolus" (Charles), from a diploma of his father, and from his own charters. Modern scholars have typically called him Charles Constantine, but this was not a name used during his lifetime.....
He was married to Thiberge de Troyes. It has been speculated that Constance, wife to Boso II of Arles and grandmother of Queen Constance of Arles, was their daughter
http://en.wikipedia.org/wiki/Charles_Constantine_of_Vienne