| Marchioness of Montferrat Isabel de Clare | |
| B: | May 1240 |
| Tonbridge, Kent, England | |
| D: | 1271 |
| Lord of Inchiquin and Youghal - Lord of Thomond Thomas de Clare | |
| B: | 1245 |
| Tonbridge, Kent, England | |
| D: | 29 Aug 1287 |
| Clare County, Ireland | |
 | Juliana FitzGerald 1263-1300 |
| Juliana FitzGerald | |
| B: | 1263 |
| Dublin, Ireland | |
| D: | 24 Sep 1300 |
| Clare County, Ireland | |
| 7th Earl of Gloucester, Earl of Clare, Earl of Hertford Lord Gilbert de Clare, IV | |
| B: | 2 Sep 1243 |
| Christchurch, Hampshire, England | |
| D: | 7 Dec 1298 |
| Monmouthshire, Wales | |
| Princess of England Joan of Acre Plantagenet | |
| B: | 1272 |
| Israel | |
| M: | 30 Apr 1290 |
| Westminster, London, England | |
| D: | 23 Apr 1307 |
| Clare, Suffolk, England | |
 | Maud de Lacy 1223-1289 |
| Maud de Lacy | |
| B: | 25 Jan 1223 |
| Lincoln, Lincolnshire, England | |
| D: | 10 Mar 1289 |
| Lincoln, Lincolnshire, England | |
| Eighth Earl of Clare, Sixth Earl of Hertford, 6th Earl of Gloucester Richard de Clare, IV | |
| B: | 4 Aug 1222 |
| England | |
| M: | 2 Feb 1238 |
| D: | 14 Jul 1262 |
| Waltham, Kent, England | |
| Countess of Lincoln Margaret de Quincy 1208-1266 |
| Countess of Lincoln Margaret de Quincy | |
| B: | 1208 |
| D: | Mar 1266 |
| 2nd Earl of Lincoln John de Lacy 1192-1240 |
| 2nd Earl of Lincoln John de Lacy | |
| B: | 1192 |
| Lincoln, Lincolnshire, England | |
| D: | 22 Jul 1240 |
| 1st Countess of Lincoln Hawise de Kevelioc | |
| B: | 1180 |
| Chester, Cheshire, England | |
| D: | 3 Mar 1243 |
We make every effort to document our research. There is a lot of information that I do not have, and I know there are mistakes in this tree. My feelings will not be hurt if you give me corrections or additional information, especially if you can provide sources for the information.
