William Montagu, 2nd Earl of Salisbury, 4th Baron Montagu, King of Mann, KG was an English nobleman and commander in the English army during King Edward III's French campaigns in the Hundred Years War
"Conte de Salisbery, Will(ia)m", William de Montagu, 2nd Earl of Salisbury, KG, illustration from the Bruges Garter Book, c.1430. The arms of Monthermer (Or, an eagle displayed vert beaked and membered gules) shown quartered by Montagu on his tabard are apparently incorrect, as it was his younger brother John de Montagu, 1st Baron Montagu (c. 1330 – c. 1390) who married the Monthermer heiress.
Monumental brass of Sir William Salisbury (d.1383), All Saints' parish church, Calbourne, Isle of Wight