Roger de Mortimer, 2nd Earl of March, 4th Baron Mortimer of Wigmore, KG was an English nobleman and military commander during the Hundred Years' War.
Conte de la Marsche, Roger, illustration from the Bruges Garter Book, c.1450. He displays the arms of Mortimer on his tabard.
William Montagu, alias de Montacute, 1st Earl of Salisbury, 3rd Baron Montagu, King of Man was an English nobleman and loyal servant of King Edward III.
Roger Mortimer, 2nd Earl of March
…English forces then moved into Burgundy, where Roger died suddenly at Rouvray, near Avallon. Roger married Philippa de Montagu (1332–1381), daughter of William Montagu, 1st Earl of Salisbury, and Catherine Grandison and had by her two sons: Roger Mortimer, who died young…
William Montagu from the Salisbury Roll, c. 1463. He displays the Montagu arms (modern) Argent, three fusils conjoined in fess gules on his breastplate, whilst his maternal arms of de Montfort (Bendy of eight or and azure) are shown on a shield at left.
Edward III founded the Order of the Garter in 1348, and included Salisbury's son among the founding members.
Salisbury's residence of Bisham Manor in Berkshire.