William d'Aubigny I (d. after 1148), was an itinerant justice under King Henry I of England.
William was a son of Main d'Aubigny, Breton lord of Saint-Aubin-d'Aubigné (now in Ille-et-Vilaine department) and Adelaïde de Bohun, daughter of Humphrey with the Beard.
[1] He was allowed to marry Cecily, the elder daughter of Roger Bigod, sheriff of Norfolk.
Through her, he acquired a part of the honour of Belvoir in Leicestershire – his castle became the centre of the family estates – after his mother-in-law, who had been the heir of Robert de Todeni, lord of Belvoir, died about 1130.
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