Isabella Mac William

Isabella mac William (born c. 1165) (Gaelic: Isibéal nic Uilliam) was the illegitimate daughter of William the Lion King of Scots by a daughter of Robert Avenel. She married Robert III de Brus in 1183. They had no children. After his death in 1191, Isabella was married to Robert de Ros, Baron Ros of Wark (died 1227). They had the following children:

  • Sir William de Ros (b. before 1200 – d. ca. 1264/1265).
  • Sir Robert de Ros[1] (ca. 1223 – 13 May 1285), was Chief Justice of the Kings Bench. He married Christian Bertram.
  • Sir Alexander de Ros (d. ca. 1306), who fathered one child, William, with an unknown wife.[1]
  • Peter de Ros.[1]

References
  1. Douglas Richardson, , Kimball G. Everingham (2011). Magna Carta ancestry : a study in colonial and medieval families, Volume II (2nd ed.). Salt Lake City, UT.: Douglas Richardson. p. 198. ISBN 9781449966386.
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