2nd Earl of Lincoln John de Lacy
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- 1 2nd Earl of Lincoln John de Lacy [1] b. 1192 d. 22 Jul 1240
Countess of Lincoln Margaret de Quincy b. 1208 d. Mar 1266
- 2 Maud de Lacy [1.1]
b. 25 Jan 1223 d. 10 Mar 1289
Eighth Earl of Clare, Sixth Earl of Hertford, 6th Earl of Gloucester Richard de Clare, IV b. 4 Aug 1222 d. 14 Jul 1262
- 3 Marchioness of Montferrat Isabel de Clare [1.1.1]
b. May 1240 d. 1271
- 3 Lord of Inchiquin and Youghal - Lord of Thomond Thomas de Clare [1.1.2]
b. 1245 d. 29 Aug 1287
Juliana FitzGerald b. 1263 d. 24 Sep 1300
- 4 Baroness Badlesmere Margaret de Clare [1.1.2.1]
b. 1 Apr 1287 d. 3 Jan 1333 [ =>]
- 4 Baroness Badlesmere Margaret de Clare [1.1.2.1]
- 3 7th Earl of Gloucester Lord Gilbert de Clare, IV [1.1.3]
b. 2 Sep 1243 d. 7 Dec 1298
Princess of England Joan of Acre Plantagenet b. 1272 d. 23 Apr 1307
- 4 suo jure 6th Lady of Glamorgan Eleanor de Clare [1.1.3.1]
b. 3 Oct 1292 d. 30 Jun 1337 [ =>]
- 4 Elizabeth de Clare [1.1.3.2]
b. 16 Sep 1295 d. 4 Nov 1360 [ =>]
- 4 Countess of Cornwall Margaret de Clare [1.1.3.3]
b. 12 Oct 1292 d. 9 Apr 1342 [ =>]
- 4 suo jure 6th Lady of Glamorgan Eleanor de Clare [1.1.3.1]
- 3 Marchioness of Montferrat Isabel de Clare [1.1.1]
- 2 Maud de Lacy [1.1]