William III De Montague & Elizabeth De Mohun 
They had a son named Sir William IV.
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Personal Details
William III De Montague
William III was born on June 25th, 1328 in Donyatt, Somerset, England.1 He died at the age of 68 on June 3rd, 1397 in Castle Wallingford, Berkshire, England.1
Elizabeth De Mohun
Elizabeth was born in 1353 in Dunster, Somerset, England. She died in Castle Wallingford, Berkshire, England.
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Children
Sir William IV De Montague
Sir William IV was born in 1360 in Castle Wallingford, Berkshire, England. He died at the age of 22 on August 6th, 1382 in Killed in a joust at Windsor Castle.