Guillaume II Duke of Normandy donated "nostras insulas Serc et Aurrene, propter medietatem Grenere" to the abbey of Mont-Saint-Michel, supported by "Rannulfo filio Anschitilli", by charter dated to [1042].
Vicomte du Bessin (Bayeux). Guillaume de Poitou records that "Randulfum Baiocensium vicecomitem" supported "Guido filius Burgundionum comitis" in his rebellion, dated to [1047]. "…Rannulfi filii Ascelini" witnessed the charter dated to [1047 or before] under which Guillaume II Duke of Normandy confirmed the donation by "Adelelmi…Beatricis uxor eius…Rotberti filius eius" to the abbey of Mont-Saint-Michel.
Orderic Vitalis records that "Ranulfum Bajocensem ac Haymonem Dentatum et Nigellum de Constantino" rebelled against Guillaume II Duke of Normandy at the battle "apud Vallesdunas". 1
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