William Longespee, 3rd Earl of Salisbury was born circa 1176 in England, United Kingdom to Henry II of England (1133-1189) and Ida de Tosny (c1150-) and died 7 March 1226 Salisbury Castle, Salisbury, Wiltshire, England, United Kingdom of unspecified causes. He married Ela, 3rd Countess of Salisbury (c1187-1261) 1196 JL .
William de Longespée, 3rd Earl of Salisbury also known as William Longsword, was an illegitimate son of King Henry II. He received his title by marrying the daughter of William of Salisbury, the 2nd Earl of Salisbury.
Military Service
William was an army commander from 1210-1212. He led a naval fleet in the Battle of Damme. He commanded an army unit in the Battle of Bouvines. He fought in support of King John after the sigining of the Magma Carta, but then switched sides. He also fought in support of John's successor, Henry III.
Children
| Name | Birth | Death | Joined with |
| William Longespée (c1212-1250) | 1212 | 7 February 1250 Mansoura, Egypt | Idonea de Camville (c1208-c1252) |
| Richard Longespée (aft1209-) | |||
| Stephen Longespée (1216-1260) | 1216 | 1260 | Emmeline de Ridelsford (?-?) |
| Nicholas Longespée (-1297) | |||
| Isabella Longespée (-bef1248) | |||
| Petronilla Longespée (-) | |||
| Ella Longespée (c1220-1298) | 1220 | 9 February 1298 | Thomas of Warwick (1208-1242) Philip Basset (c1185-1271) |
| Ida Longespée (-aft1265) | 1267 | Ralph de Somery (-c1220) William de Beauchamp (c1186-1260) | |
Footnotes (including sources)
| ‡ General |