William de Percy , Lord of Topcliffe, Sir 
William de was born in 1112 in Topcliffe, Yorkshire, England. William de's father was Alan "The Great Alan" de Percy , Sir and his mother was Emma de Gand. He had a brother named Walter de. He was the older of the two children. He died at the age of 62 in 1174 in Sallay, Craven, Yorkshire, England (dspml).General Notes
William; fought on King Stephen's side at the Battle of the Standard 1138 against the invading Scots under David I; founded Sallay Abbey Jan 1147/8, having presented the Abbey with lands for its upkeep and a site for its physical construction; probably founded also Stainfield Priory, Lincs, and made gifts to Byland and Fountains Abbeys, at the latter of which he was later buried; married 1st Alice or Adelaide de Tonbridge (died between 1148 and c1166), probably daughter of Richard FitzGilbert de (Lord of) Clare by Alice, sister of Ranulph, Earl of Chester; married 2nd c1166, as her 2nd of three husbands, Sibyl de Vaognes (died in or after 1212), widow of Robert de Ros, and dspml by Easter 1175. [Burke's Peerage]
William de and Sybil de were married in a religious ceremony about 1166 in 2nd husband 2nd wife.
William de and Adeliza de were married in a religious ceremony in 1st wife. They had a daughter named Agnes de.
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Children
Agnes de Percy
Agnes de was born in 1134 in Topcliffe, Yorkshire, England. She died before October 13th, 1204 in Petworth, Sussex, England.
William de and Unknown were married in a religious ceremony in No Marriage. They had a daughter named Emma de.
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