Maguire, Cúchonnacht Mór (c.1650–91), Jacobite landowner and soldier, was the only son of Hugh Maguire of Tempo, Co. Fermanagh (an officer of the Irish confederate army who was killed at the battle of Glenswilly in the year of Cúchonnacht's birth) and his wife (née O'Reilly). In 1655 the boy succeeded his grandfather Brian – an ‘innocent papist’ whose property remained intact even under the Cromwellian administration – as owner of the Tempo estate. After coming of age in the early 1670s Maguire began to live well beyond his modest income, borrowing heavily from his protestant neighbours and being obliged to sell some of his land. He married (c.1675) Mary Magennis, daughter of Ever Magennis, of Castlewellan, Co. Down.
As the sole resident Irish catholic landowner in Fermanagh, Maguire became a figure of some importance during the brief reign of James II (qv). In 1687 he was appointed high sheriff of the county and deputy lieutenant, and his name headed the list of aldermen of the corporation of Londonderry when the Irish corporations were remodelled by James's viceroy Tyrconnell (qv). At the revolution he supported the Jacobite cause, raising a regiment of foot on James's behalf. Apart from a passing reference in 1689 to his having become commander of a force of northern Gaels, nothing is known of his movements before the summer of 1691, when he led his regiment at the battle of Aughrim (12 July). According to a passage in an anonymous Jacobite poem (in Latin) of contemporary date, Maguire (‘Guevarrus’) and his men behaved with notable bravery in that desperate encounter, capturing the Dutch guns before being overwhelmed and annihilated. A family tradition relates that his severed head was carried from the battlefield by a devoted retainer, who buried it at Devenish Abbey on Lough Erne.
The Tempo estate, already occupied by local Williamites, was officially declared forfeit in 1692. For several years it was in the hands of James Corry of Castlecoole (ancestor of the earls of Belmore) but Maguire's widow and eldest son Brian successfully petitioned for its restoration ten years later on the strength of the marriage settlement of 1675, which proved that Cúchonnacht had possessed only a life interest.