Marmaduke De Thweng
- 1284
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| Marmaduke De Thweng -1297 |
| Marmaduke De Thweng | |
| D: | 11 Sep 1297 |
| Killed At Stirling | |
| William (2nd Lord Thweng) De Thweng -Bef 1340 |
| William (2nd Lord Thweng) De Thweng | |
| D: | Bef 19 Nov 1340 |
| Dsp | |
| Robert 3rd Lord Thweng -1344 |
| Robert 3rd Lord Thweng | |
| D: | 22 Apr 1344 |
| Unmarried | |
 | Katherine Thweng -Yes, date unknown |
| Katherine Thweng | |
| D: | Yes, date unknown |
| Sir Ralph Daubeny -Yes, date unknown |
| Sir Ralph Daubeny | |
| D: | Yes, date unknown |
| Thomas 4th Lord Thweng -1374 |
| Thomas 4th Lord Thweng | |
| D: | 24 May 1374 |
| Unmarried | |
| Lucia De Thweng -Yes, date unknown |
| Lucia De Thweng | |
| D: | Yes, date unknown |
| Robert De Lumley -Bef 1325 |
| Robert De Lumley | |
| D: | Bef 20 Jul 1325 |
| Marmaduke (1st Lord Thweng) De Thweng -Bef 1323 |
| Marmaduke (1st Lord Thweng) De Thweng | |
| D: | Bef 26 Feb 1323 |
| Isabel De Ros -1309 |
| Isabel De Ros | |
| M: | 1273 |
| D: | 1309 |
| Robert De Thweng -1284 |
| Robert De Thweng | |
| D: | 1284 |
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| Marmaduke De Thweng -1284 |
| Marmaduke De Thweng | |
| D: | Between 1282 and 1284 |
| Lucy (of Skelton) De Brus -Yes, date unknown |
| Lucy (of Skelton) De Brus | |
| D: | Yes, date unknown |