Family: William Montagu, 3rd Baron Montagu / Catherine De Grandison (F917)
m. 1320
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Male
William Montagu, 3rd Baron Montagu
Birth 1301 Oxfordshire, England 
Christening 1320 Death 30 Jan 1344 Berkshire, England Burial 1344 Berkshire, England Marriage 1320 Oxfordshire, England Father William De Montagu, 2nd Baron Montagu | F3032 Group Sheet Mother Elizabeth De Montfort, Baroness Montagu | F3032 Group Sheet
Female
Catherine De Grandison
Birth 1304 Herefordshire, England Death 23 Nov 1349 Berkshire, England Burial 1349 Berkshire, England Father William De Grandison, 1st Baron Grandison | F870 Group Sheet Mother Sibyl De Tregoz | F870 Group Sheet
Male
+ John Montagu
Birth 1328 Somerset, England Death 25 Feb 1389 Devonshire, England Burial 1389 Wiltshire, England Spouse Margaret de Monthermer | F8700 Marriage 2 Jul 1350 Devonshire, England
Female
+ Sybil Montagu
Birth Abt 1332 Somerset, England Death 30 Jan 1354 Somerset, England Burial Spouse Edmund Arundel | F8787 Marriage Bef Jul 1349
Female
+ Philippa De Montacute, Countess Of March
Birth 5 Jan 1332 Wiltshire, England Death 5 Jan 1381 Berkshire, England Burial Spouse Roger De Mortimer | F700 Marriage Abt 1358 Perthshire, England