William de Montagu Baron Montagu(abt 1275 - 18 Oct 1320)William de Grandison Sir Knight(abt 1260 - 27 Jun 1335)
Elizabeth de Montfort Baroness Montagu(abt 1275 - 1345)Sybil Tregoz(1271 - 12 Oct 1334)
m. 1327, Cassington, Oxfordshire, England
b. 1303, Cassington, Oxfordshire, England
d. 30 Jan 1344, Windsor Castle, Berkshire, England
br.  
occ. 1st Earl of Salisbury
b. abt 1304, Ashford, Hertfordshire, England
d. 23 Nov 1349, Bisham, Berkshire, England
br.  
occ.  
Children
> Philippe de Montagu Countess March(abt 1332 - 5 Jan 1382)
> John Montagu(abt 1327 - 25 Feb 1389)