Cathbarr's elder half-brother, Sir Domhnaill Ó Domhnaill, was a dynastic rival of Cathbarr's elder full brother, Aodh Ruadh Ó Domhnaill II (Red Hugh O'Donnell II), in the lengthy Ó Domhnaill succession dispute until Sir Domhnaill's death at the Battle of Doire Leathan in September 1590. Aodh Ruadh II (Red Hugh II) became head of the Ó Domhnaill dynasty in 1592. Cathbarr supported his elder brother during Tyrone's Rebellion (1594–1603). In 1602, another elder brother, Rory, succeeded Aodh Ruadh and made peace with the Crown. The following year, Rory was made Earl of Tyrconnell.
After Cathbarr's death, Rosa remarried to the Irish soldier Owen Roe O'Neill. Cathbarr's son with Rosa, Hugh O'Donnell became a Captain in the Spanish Army, serving in his stepfather's regiment in Flanders. He was killed in 1625 during the Siege of Breda.[3]
^The historicity of this person is disputed; Ó Domhnaill, Niall; Na Glúnta Rosannacha (1952), page 87
^Annals of the Four Masters: "1590: ...the son of O'Donnell himself, who, being unable to display prowess or defend himself, was slain at Doire-leathan, on one side of the harbour of Telinn, on the 14th of September."
^ abConcannon, p. 218-219 "Siobhan was probably the eldest of the family, and must have been born not later than 1569." "We know little of Siobhan, who can hardly have been more than one-and- twenty, when she died in 1590."
^ abOxford Dictionary of National Biography 2004, p. 511-512
^Annals of the Four Masters: "1602:...O'Donnell should take the disease of his death and the sickness of his dissolution; and, after lying seventeen days on the bed, he died, on the 10th of September, in the house which the King of Spain himself had at that town (Simancas)...""
^ abcWebb, Alfred (1878). "Rury O'Donnell". A Compendium of Irish Biography.
^ abSilke 2006 "Hugh Albert O'Donnell, born [to Rory and Bridget] about October 1606, was the only son of this marriage, Mary Stuart O'Donnell being born about a year later."
^Bagwell 1895 "About ninety persons sailed with the earls, among whom were Tyrconnel's son Hugh, aged eleven months..."
^Ulwencreutz, Lars (2013), Ulwencreutz's The Royal Families in Europe V, p. 136, ISBN978-1-304-58135-8 "Hugh O'Donnell, 2nd Earl of Tyrconnell (1606-1642) Prince and Lord of Tryconnell".
^Casway 2009. Casway gives her birthdate as c. 1575
^Concannon, p. 218 "O'Clery tells us that Nuala was already married to Niall Garbh in 1592. This will place her birth-year with some degree of probability about 1577 — not later."
^Annals of the Four Masters: "1608: Niall Garv O'Donnell, with his brothers Hugh Boy and Donnell, and his son, Naghtan, were taken prisoners about the festival of St. John in this year."
^According to the English officials who wrote the Calendar of State Papers, Hugh Roe personally killed Niall Garve's four-year-old son (also his own nephew)
^Concannon, p. 218 "Manus may have been born about 1579 or 1580. He was old enough to play a man's part in the battle in which he met his death at the hands of Niall Garbh (A.D. 1600)"Lughaidh Ó Cléirigh names the sons in the order of their birth: Hugh Roe, Ruairi, Manus and Cathbar.
^O'Donnell, Eunan; Reflection on the Flight of the Earls; Donegal Annual, Bliainiris Dhún na nGall, Journal of the County Donegal Historical Society, No. 58 (2006); pp. 31-44. Gráinne is known only as a sister of the Earl (i.e., Rory), with no additional information.
Bibliography
Concannon, H. "'The Woman of the Piercing Wail' (The Lady Nuala O'Donnell)". The Irish ecclesiastical record. 16. Dublin: John F. Fowler.
Silke, John J. (May 2006). "O'Donnell, Rury , styled first earl of Tyrconnell (1574/5–1608)". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/20559.
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