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.
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.
Effigy of Elizabeth de Montfort, wife of William Montagu, in Christ Church Cathedral, Oxford