Family: Ferdorcha Matthew O'Neill / Siobhán Maguire (F5410)
m. 1540
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 | Conn Bacagh O'Neill, 1st Earl of Tyrone  (1480-1559)
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 | Alice FitzGerald, Countess of Tyrone  (1480-1530)
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| Constantine Maguire, Prince of Fermanaugh (1480-1589)
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| Margaret O'Neill (1460- ) |
| Ferdorcha Matthew O'Neill (1520-1609)
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| Siobhán Maguire (1520-1600)
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| Margaret O'Neill (1558-1620)  |