William Montagu 1st Earl of Salisbury

✓ William Montagu (de Montacute), 1st Earl of Salisbury (cr. 1337), Edward III's companion in the seizure of Mortimer at Nottingham 1330; father of Sibyl, wife of Sir Edmund de Arundel (CP I 'Arundel' p.244 note b: 'Sibyl, da. of William (Montagu), Earl of Salisbury'). His wife Katherine Grandison and his own ancestry (CP XI 'Salisbury', not online) are note-only. Died 30 Jan 1343/4 of injuries at a Windsor tournament. Source: Complete Peerage 2nd ed. vol. I (1910), 'Arundel' pp.242-244 and notes (archive.org completepeerageo01coka), read 27 Oct 2026. [DIRECT ANCESTOR OF THE COMPILER: flag added 27 Oct 2026 by walking the tree from Aynsley, so that this marker is reliable and can be searched.]