There are conflicting accounts of his parentage, one popular solution making him the son and successor of a count Berengar (sometimes identified with Berengar of Rennes, sometimes with that man's supposed maternal grandson of the same name) by a daughter of Gurvand, Duke of Brittany.
There are differing reports about his ancestry, one widely accepted theory suggesting he was the son and heir of a Count Berengar (sometimes mistakenly attributed to Berengar of Rennes, sometimes to that man's supposed maternal grandson of the same name) by a daughter of Gurvand, Duke of Brittany.