Henry Brienne de Beaumont, 4th Earl of Buchan, 1st Baron Beaumont, Constable of England, Justiciar of Scotland, was born circa 1255 to Louis de Brienne (c1235-1263) and Agnès de Beaumont-au-Maine (c1225-1301) and died 10 March 1340 of unspecified causes. He married Alice Comyn (bef1296-bef1349) 14 July 1310 JL . William I of England (1027-1087), Henry II of England (1133-1189), 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.
|Offspring of Henry de Beaumont, 4th Earl of Buchan and Alice Comyn (bef1296-bef1349)|
|Catherine de Beaumont|
|John de Beaumont (c1317-1342)||1317||May 1342||Eleanor Plantagenet (c1318-1372)|
|Isabella de Beaumont (c1320-1361)||1320||1361||Henry of Grosmont, 1st Duke of Lancaster (c1310-1361)|