Isabella mac William (born 1165) (Gaelic: ''Isibéal nic Uilliam'') was the illegitimate daughter of
William the Lion King of Scots
The monarch of Scotland was the head of state of the Kingdom of Scotland. According to tradition, the first King of Scots was Kenneth I MacAlpin (), who founded the state in 843. Historically, the Kingdom of Scotland is thought to have gro ...
by a daughter of
Robert Avenel
Robert Avenel (died 8 March 1185) was a 12th-century Anglo-Norman magnate. He was ruler of the small former Northumbrian province of Eskdale in Dumfriesshire, as well as Abercorn in West Lothian. He was one of a small number of Anglo-Norman immig ...
. 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
(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.
* Peter de Ros.
References
{{DEFAULTSORT:Isabella Mac William
1160s births
Year of death unknown
12th-century Scottish people
12th-century Scottish women
Illegitimate children of Scottish monarchs
De Ros family
House of Dunkeld
House of Bruce
Daughters of kings