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Male William III 2nd Baron de Montagu , KB Click to view William III 2nd Baron de Montagu , KB in the family tree

William III 2nd Baron de was born about 1273 in Cassington, Oxfordshire, England.  William III 2nd Baron de's father was Simon 1st Baron de Montagu , Sir and his mother was Aufrica Princess of Isle of Man.  His paternal grandparents were William II de Montagu , Sir Knight and Berta; his maternal grandfather was Fergus King of the Isle of Man. He had a half-sister named Isabella de.  He died on October 18th, 1319 in Gascony, France.


William III 2nd Baron de's family with Elizabeth de Montfort

‌William III 2nd Baron de and Elizabeth de were married in a religious ceremony about 1292 in Cassington, Oxfordshire, England.  They had two sons and a daughter, named John de, William IV de and Alice.

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