Tracing Douglas family roots - unraveling history, one generation at a time.
- 1241
| Henry (King of Ulster) O'Neill | |
| D: | 1347 |
| Brian (King of Cenel Eoghain) O'Neill | |
| D: | 1295 |
| Ardh Buie (King of Ailech) O'Neill | |
| D: | 1283 |
|
| Domnall (King of Ulster) O'Neill | |
| D: | 1241 |
| Or 1234 | |
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