1255 - 1316 (66 years)
| William De Roos 1368-Yes, date unknown |
| William De Roos | |
| B: | 1368 |
| England | |
| D: | Yes, date unknown |
| Thomas De Clifford Baron Clifford 1363-1391 |
| Thomas De Clifford Baron Clifford | |
| B: | 1363 |
| D: | 18 Aug 1391 |
| Thomas De Roos Baron Roos Of Helmesley 1336-Yes, date unknown |
| Thomas De Roos Baron Roos Of Helmesley | |
| B: | 1336 |
| England | |
| D: | Yes, date unknown |
| John De Welles Baron Welles, Of Gainsby 1352-1421 |
| John De Welles Baron Welles, Of Gainsby | |
| B: | 20 Apr 1352 |
| Welle, Lincoln Or Conisholme, Lincoln | |
| D: | 26 Aug 1421 |
 | Eleanor De Mowbray Bss Welles 1364-Aft 1444 |
| Eleanor De Mowbray Bss Welles | |
| B: | 25 Mar 1364 |
| Of Epworth, Isle Of Axholme, Lincolnshire | |
| M: | Abt May 1384 |
| D: | Aft 1444 |
| Maud De Roos -1388 |
| Maud De Roos | |
| D: | 9 Dec 1388 |
| John De Welles Baron Welles 1334-Yes, date unknown |
| John De Welles Baron Welles | |
| B: | 1334 |
| M: | Between 1344 and 1345 |
| D: | Yes, date unknown |
| William De Roos Baron Roos, IV 1290-1343 |
| William De Roos Baron Roos, IV | |
| B: | 1290 |
| Of Helmsley, Yorkshire | |
| D: | Between 3 Feb 1342 and 1343 |
| England | |
| Margery De Badlesmere 1315-1363 |
| Margery De Badlesmere | |
| B: | Between 1306 and 1315 |
| Castle Badlesmere, Kent, England | |
| M: | 1326 |
| Castle Wark, Northumberland | |
| D: | 18 Oct 1363 |
| Of Helmsley, Yorkshire, England | |
|
| William De Roos Baron Roos, Of Belvoir III | |
| B: | Between 1250 and 1255 |
| Yorkshire, England | |
| D: | 15 Aug 1316 |
| Maud De Vaux Abt 1244-Yes, date unknown |
| Maud De Vaux | |
| B: | Abt 1244 |
| M: | 1287 |
| D: | Yes, date unknown |
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