Joan Plantagenet of England was born April 1272 in Acre, Israel to Edward I of England (1239-1307) and Eleanor of Castile (1241-1290) and died 7 April 1307 Clare Castle, Clare, Suffolk, England, United Kingdom of unspecified causes. She married Gilbert de Clare, 7th Earl of Gloucester (1243-1295) 1 April 1290 JL in Westminster Abbey, England, United Kingdom. She married Ralph de Monthermer, 1st Baron Monthermer (1270-1325) January 1297 JL .
Children
| Name | Birth | Death | Joined with |
| Gilbert de Clare, 8th Earl of Gloucester (1291-1314) | 10 May 1291 | 24 June 1314 Bannockburn, Scotland, United Kingdom | Matilda de Burgh (c1288-1320) |
| Eleanor de Clare (1292-1337) | 3 October 1292 Glamorgan, Wales, United Kingdom | 30 June 1337 | Hugh le Despenser, 1st Baron le Despenser (c1286-1326) William de Mortimer (c1280-1336) |
| Margaret de Clare (1293-1342) | 1293 | April 1342 | Piers Gaveston, 1st Earl of Cornwall (1284-1312) Hugh de Audley, 1st Earl of Gloucester (c1291-1347) |
| Elizabeth de Clare (1295-1360) | 16 September 1295 England, United Kingdom | 4 November 1360 England, United Kingdom | John de Burgh (c1286-1313) Theobald II de Verdun (-1316) Roger d'Amory (c1290-1322) |
| Name | Birth | Death | Joined with |
| Mary de Monthermer (1297-c1371) | |||
| Joan de Monthermer (1299) | |||
| Thomas de Monthermer, 2nd Baron Monthermer (1301-1340) | 4 October 1301 | 24 June 1340 | Margaret Teyes |
| Edward de Monthermer (1304-1339) | |||
Footnotes (including sources)
| ‡ General |
| ₪2 Wedding 2 |