_GILBERT de CLARE SIR, 7th EARL OF CLARE________+
| (.... - 1230) m 1217
_RICHARD de CLARE SIR, 8th EARL OF CLARE___________|
| (1222 - 1262) m 1237 |
| |_ISABEL MARSHALL _______________________________+
| (1206 - 1240) m 1217
_GILBERT de CLARE SIR "THE RED" EARL OF GLOUCESTER_|
| (1243 - 1299) m 1290 |
| | _JOHN de LACY OF HATTON_________________________+
| | | (1192 - 1240) m 1221
| |_MAUD de LACY COUNTESS OF LINCOLN__________________|
| (1223 - 1289) m 1237 |
| |_MARGARET DE QUINCEY ___________________________+
| (1208 - 1266) m 1221
|
|--MARGARET DE CLARE
| (1292 - 1342)
| _HENRY III OF ENGLAND KING OF ENGLAND___________+
| | (1207 - 1272) m 1237
| _EDWARD I OF ENGLAND "LONGSHANKS", KING OF ENGLAND_|
| | (1239 - 1307) m 1254 |
| | |_ELEANOR OF PROVENCE COUNTESS OF PROVENCE_______+
| | (1217 - 1291) m 1237
|_JOAN PLANTAGENET OF ACRE, PRINCESS OF ENGLAND_____|
(1272 - 1307) m 1290 |
| _FERNANDO III OF CASTILE KING OF CASTILE & LEON_+
| | (1201 - 1252) m 1237
|_ELEANOR OF CASTILE PRINCESS OF CASTILE AND LEON___|
(1244 - 1291) m 1254 |
|_JOAN de DAMMARTIN _____________________________+
(1216 - 1279) m 1237