Margaret Monthermer was born 14 October 1329 in Saint Humbert, Stokenham, Devonshire to Thomas de Monthermer, 2nd Baron Monthermer (1301-1340) and Margaret Teyes and died 24 March 1394 of unspecified causes. William I of England (1027-1087), Henry II of England (1133-1189), Charlemagne (747-814), Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Hugh Capet (c940-996)/s, William I of England (1027-1087)/s, Rollo of Normandy (860-932)/s.
|John Montacute, 3rd Earl of Salisbury (c1350-1400)||1350 England, United Kingdom||5 January 1400 Cirencester, Gloucestershire, England, United Kingdom||Maud Francis (c1370-c1424)|
|Simon Montague (c1353-)||1353 Salisbury, Wiltshire, England||Eleanor Boughton|
|Eleanor de Montacute|
|Thomas de Montacute|
|Margaret Monthermer (1329-1394)||14 October 1329 Saint Humbert, Stokenham, Devonshire||24 March 1394||John de Montacute, 1st Baron Montacute (c1330-c1390)|