He was the son of Sir Geoffrey Mowbray by a daughter of Red John Comyn, Justiciary of Scotland. Philip married Eve, Lady Redcastle. During the Wars of Scottish Independence, he made a deal with Edward Bruce, the King's younger brother, which led to the Battle of Bannockburn. He was subsequently killed alongside Edward Bruce at the Battle of Faughart in 1318.
- Burke, John (1833). A Genealogical and Heraldic History of the Commoners of Great Britain and Ireland. London: R. Bentley, New Burlington Street. p. 127.
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