At some point between 1086 and 1094, D'Oyly was granted possession of two mills on the west side of Grandpont by Abbot Columbanus of Oxford, however by 1109 the mills were recorded as having been reconfirmed to the abbey.
D'Oyly married Agnes, and left two sons, Robert D'Oyly the younger, the eldest son, who succeeded as Lord High Constable and Baron of Hocknorton and Fulk, buried at Eynesham in 1126. In 1120, King Henry I of England caused Edith Forne, his concubine, to marry Robert. As a marriage portion, he gave her the Manor of Cleydon, Buckinghamshire.
- Victoria County History of Oxford Volume IV by Alan Crossley, 1969
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