1208 - 1266 (58 years)
| Marchioness of Montferrat Isabel de Clare | |
| B: | May 1240 |
| Tonbridge, Kent, England | |
| D: | 1271 |
 | Baroness Badlesmere Margaret de Clare 1287-1333 |
| Baroness Badlesmere Margaret de Clare | |
| B: | 1 Apr 1287 |
| Bunratty, Clare, Ireland | |
| D: | 3 Jan 1333 |
| London, England | |
 | 1st Baron de Badlesmere Bartholomew de Badlesmere Abt 1275-1322 |
| 1st Baron de Badlesmere Bartholomew de Badlesmere | |
| B: | Abt 1275 |
| Badlesmere, Kent, England | |
| M: | 30 Jun 1308 |
| D: | 14 Apr 1322 |
| Canterbury, Kent, England | |
| 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 | |
| suo jure 6th Lady of Glamorgan Eleanor de Clare | |
| B: | 3 Oct 1292 |
| Glamorgan, Wales | |
| D: | 30 Jun 1337 |
| Tewkesbury, Gloucestershire, England | |
| 1st Lord Despenser and Lord of Glamorgan Hugh Despenser, the Younger | |
| B: | 1 May 1286 |
| Gloucestershire, England | |
| M: | May 1306 |
| Westminster, Middlesex, England | |
| D: | 24 Nov 1326 |
 | Elizabeth de Clare 1295-1360 |
| Elizabeth de Clare | |
| B: | 16 Sep 1295 |
| Tewkesbury, Gloucestershire, England | |
| D: | 4 Nov 1360 |
| Ware, Hertfordshire, England | |
 | Theobold de Verdun 1278-1316 |
| Theobold de Verdun | |
| B: | 8 Sep 1278 |
| Cheadle, Staffordshire, England | |
| D: | 27 Jul 1316 |
| Alton, Staffordshire, England | |
 | Countess of Cornwall Margaret de Clare 1292-1342 |
| Countess of Cornwall Margaret de Clare | |
| B: | 12 Oct 1292 |
| Tewkesbury, Gloucestershire, England | |
| D: | 9 Apr 1342 |
| Badlesmere, Kent, England | |
| 1st Earl of Gloucester Hugh de Audley, II | |
| B: | 1289 |
| Oxfordshire, England | |
| M: | 28 Apr 1317 |
| D: | 10 Nov 1347 |
| Tonbridge, Kent, England | |
 | 1st Earl of Cornwall Piers Gaveston Abt 1284-1312 |
| 1st Earl of Cornwall Piers Gaveston | |
| B: | Abt 1284 |
| France | |
| M: | Oct 1307 |
| D: | 19 Jun 1312 |
| 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 |
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.
