Commentary
Charles Cawley, confused which Montagu married Isabel.
Family
ClaimDetailEvidence
FatherRichard de Montagu (e1109-~1166) [S775:IX.75] [S925] [S3175]
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MotherAlice (e1110-) [S775:IX.75] [S925] [S3175]
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SpouseIsabel (e1140-) 
Child +Dreux de Montagu (e1180-<1217) [S775:IX.75] [S3168] [S3175]
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Attributes
ClaimDetailEvidence
GenderMale
NameWilliam de Montagu [S775:IX.75] [S925] [S3175]
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FatherRichard de Montagu (e1109-~1166) [S775:IX.75] [S925] [S3175]
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MotherAlice (e1110-) [S775:IX.75] [S925] [S3175]
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Timeline
ClaimDateDetailAgeEvidence
Birthest 1139 (1137-1142)
 
Flourishedaft 1162 [S775:IX.75] 21y
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Flourished1178 [S775:IX.75]
he had livery of his inheritance
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Flourished1191 [S775:IX.75]
he attested two charters
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Flourished1198 [S775:IX.75]
he exchanged Sutton with William son of Robert de Montagu for Thorne
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Position 1204 to 1207 [S775:IX.75]
Custodian of Sherborne Castle
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Position 1204 to 1207 [S775:IX.75]
Sheriff of Somerset
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Position 1204 to 1207 [S775:IX.75]
Sheriff of Dorset
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Position1208 [S775:IX.75]
Justiciar
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Flourished1215 [S775:IX.75]
confirmed a grant of Shipton church to the canons of Bruton
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Flourished1215 [S775:IX.75]
rebelled, but soon submitted for which he was fined 500 marks
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Deathaft Apr 1217 [S775:IX.75]
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Deathabt Jun 1217 [S775:IX.75]
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Sources
IndexTitle
[S775] George Cokayne, "Complete Peerage" (https://dcms.lds.org/delivery/DeliveryManagerServlet?dps_pid=IE83409).
[S925] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - England Earls 1138-1143)" (2006-7 (v.1.1 Updated 26 Jun 2006 )).
[S3175] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - English Lords, L-O)" (https://fmg.ac/Projects/MedLands/ENGLISHNOBILITYMEDIEVAL3L-O.htm).