Robert Avenal
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| William De Ross 1196-1246 |
| William De Ross | |
| B: | 1196 |
| Helmsley, Yorkshire, England, United Kingdom | |
| D: | 1246 |
Lucia Fitz Piers 1250-Yes, date unknown |
| Lucia Fitz Piers | |
| B: | 1250 |
| Forest of Dean, Coleford, Gloucestershire, England, United Kingdom | |
| D: | Yes, date unknown |
| Isabella Canmore 1150-Yes, date unknown |
| Isabella Canmore | |
| B: | 1150 |
| , , Scotland, United Kingdom | |
| D: | Yes, date unknown |
| Baron of Hemsley Robert De Ross 1170-1227 |
| Baron of Hemsley Robert De Ross | |
| B: | 1170 |
| Hamlake, Yorkshire, England, United Kingdom | |
| M: | 1191 |
| Haddington, Lincolnshire, England, United Kingdom | |
| D: | 1227 |
| King of Scotland William Canmore, I 1143-1214 |
| King of Scotland William Canmore, I | |
| B: | 1143 |
| D: | 4 Dec 1214 |
| Stirling, Scotland, United Kingdom | |