William de Percy

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William de Percy, son of Alan de Percy and Emma de Gant, died after 29 September 1175,1 and was buried at Fountains Abbey, Yorkshire, England.1

William married (1) Alice de Tonbridge, whose ancestry is uncertain, before 1136;1 he married (2), as her 2nd husband, Sibyl de Valoines, daughter of Thebaud de Valoines, between 1164 and 1166.1,2

By one or more unknown mistresses he had three sons and two daughters.1

Family 1


Family 2

Alice de Tonbridge d. bt 1148 - 1164

Family 3

Sibyl de Valoines d. aft. 1212
This person was last edited on10 Jul 2021


  1. [S1947] Douglas Richardson, Royal Ancestry: A Study in Colonial and Medieval Families (Five vols., Salt Lake City, Utah: s.p., 2013), 4:343 (Percy 3), further cited as Richardson, Royal Ancestry.
  2. [S2073] K. S. B. Keats-Rohan, Domesday Descendants: A Prosopography of Persons Occurring in English Documents 1066-1166: II. Pipe Rolls to Cartae Baronum (Woodbridge, England: Boydell Press, 2002), 671, further cited as Keats-Rohan, Domesday Descendants.