William de Montacute, 1st Earl of Salisbury, King of Mann, was born 1301 in Cassington, Oxfordshire, England, United Kingdom to William de Montacute, 2nd Baron Montacute (c1285-1319) and Elizabeth de Montfort (-1354) and died 30 January 1344 Windsor, Berkshire, England, United Kingdom of unspecified causes. He married Catherine Grandison (c1304-1349) 1328 JL .
Children
| Name | Birth | Death | Joined with |
| Elizabeth de Montacute (-1359) | |||
| William de Montacute, 2nd Earl of Salisbury (1328-1397) | 20 June 1328 | 3 June 1397 | Joan of Kent (1328-1385) Elizabeth de Mohun (1343-1415) |
| John de Montacute, 1st Baron Montacute (c1330-c1390) | 1330 England | 1390 England | Margaret Monthermer (1329-1394) |
| Anne de Montagu (c1330-) | 1330 | John de Grey (bef1322-bef1351) | |
| Philippa de Montacute (1332-1382) | 1332 | 1381 | Roger Mortimer, 2nd Earl of March (1328-1360) |
| Sibyl de Montacute | |||
| Alice de Montacute | |||
Siblings
| Name | Birth | Death | Joined with |
| John de Montacute (-1317) | |||
| William de Montacute, 1st Earl of Salisbury (1301-1344) | 1301 Cassington, Oxfordshire, England, United Kingdom | 30 January 1344 Windsor, Berkshire, England, United Kingdom | Catherine Grandison (c1304-1349) |
| Simon de Montacute (-1345) | |||
| Edward de Montacute (-1361) | |||
| Alice de Montacute | |||
| Katherine de Montacute | |||
| Mary de Montacute | |||
| Elizabeth de Montacute | |||
| Hawise de Montacute | |||
| Maud de Montacute | |||
Residences
Footnotes (including sources)
| ‡ General |
