O'Donnell [Ó Domhnaill], Sir Niall Garbh
- John J. Silke
O'Donnell [Ó Domhnaill], Sir Niall Garbh (1568/9–1626?), magnate and soldier, was the eldest son of Conn O'Donnell (d. 1583) and his wife, Rose, daughter of Shane (Seán) O'Neill, and grandson of Calvagh O'Donnell, lord of Tyrconnell. Conn, who appears to have been married previously, had eight sons and at least two daughters. In 1567 the then lord deputy, ...