Hrólfr "Thurstain" Hrollaugsson

• Background Information. ³³⁸
This ancestry is said to descend from Rongwald or Raungwaldar, Earl of Maere, or the Fair haired, who was the father of Hrolf, or Rollo, the first Duke of Nomandy. Rongwald, like the majority of his countrymen and kinsmen, had several children by a favorite slave, whom he married "more Dancico," and Hrolf Thurstain, the son of one of them, followed his uncle Rollo into Normandy and was able marry Gerlotte de Blois, daughter of Thibaut, Count of Blois and Chartres. From them descended the Lord of Briquebec, Bec-Cripin, Montfort-sur-Risle and others who figure as campanions of the Conqueror.
~The Conquerors and his Companions, pg. 18

Hrólfr married Gerlotte de Blois, daughter of Thibauld comte de Blois et Comte de Chartres and Richilde de Bourges.