Thurston [sic] le Goz was born about 989 in Normandy, France. He married Judith de Montanolier about 1014. The third son of Gerlotte was Ansfrid the Dane, the first Vicomte of the Hiemois, and father of Ansfrid the second, surnamed Goz, whose son Turstain (Thurstan, or Toustain) Goz was the great favorite of Robert Duke of Normandy, the father of the Conqueror, and accompanied him to the Holy Land, and was intrusted to bring back the relics the Duke had obtained from the Patriarch of Jerusalem to present to the Abbey of Cerisi, which he had founded. Revolting against the young Duke William in 1041, Turstain was exiled, and his lands confiscated and given by the Duke to his mother, Herleve, wife of Herluin de Conteville.