Baron of Helmsley Robert de Ros
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- 1 Baron of Helmsley Robert de Ros [1] b. 1170 d. 23 Dec 1226
Isabella Mac William b. 1175 d. 23 Dec 1226
- 2 Sir William de Ros [1.1]
b. 1192 d. 1264
Lucy FitzPeter b. 1205 d. 1266
- 3 Sir Robert de Ros [1.1.1]
b. 3 Mar 1223 d. 17 May 1285
Isabel d'Aubeney b. 1233 d. 15 Jun 1301
- 4 1st Baron de Ros Sir Robert de Ros [1.1.1.1]
b. 1265 d. 3 Feb 1361 [ =>]
- 4 2nd Baron of Hamlake William de Ros [1.1.1.2]
b. 27 Jun 1244 d. 16 Aug 1316 [ =>]
- 4 1st Baron de Ros Sir Robert de Ros [1.1.1.1]
- 3 Sir Robert de Ros [1.1.1]
- 2 Sir William de Ros [1.1]