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Donnell Ballagh O'Cahan (died 1627) was an Irish landowner in Ulster. A vassal of Hugh O'Neill, Earl of Tyrone, O'Cahan was frequently in rebellion alongside his lord in the closing years of the 16th century. Although he did not go into exile with Tyrone, he claimed to have been betrayed by the English Crown, which he accused of failing to keep to an agreement over a large grant of lands. Arrested for treason, he was never brought to trial but was held captive in Tower of London until his death sometime around 1627.
Properties
O'Cahan was a major Ulster landholder[1] and has been described as "the last in a long line of chieftains" ruling the area between the River Bann in Belfast to the River Foyle in Derry, which he held off the O'Neill Earls of Tyrone as their liegeman[2] (ur ri—or under king—in gaelic).[3] His main property was in Dungiven.[1] He also held Limavady.[2] He spent much of the 1590s in armed rebellion with Tyrone against the crown; his lands were "viciously ravaged" by Docwra until O'Cahan surrendered in 160s.[4] About a third of O'Cahan's lands in Londonderry were granted to Hugh O'Neill, Earl of Tyrone,[1] who was also O'Cahan's father-in-law.[5]
Marriages
In June 1593, Donnell and his father acknowledged Tyrone as their lord.[6] Around the same time, O'Cahan married Mary O'Donnell (sister of Red Hugh O'Donnell).[6][7] O'Cahan and Mary had a son, Rory Oge O'Cahan, and a daughter.[6]
In 1598, O'Cahan succeeded to the O'Cahan chieftainship.[8][6] The same year, O'Cahan renewed his alliance with Tyrone by leaving Mary[6] and marrying his daughter Rose.[6][8][9] Rose had divorced from Red Hugh O'Donnell in 1596.[10][9] It seems O'Cahan was never formally divorced from Mary which created enmity between him and his new father-in-law.[7]
In 1607, with English authorities turned against Tyrone, George Montgomery, the new Protestant Bishop of Derry, encouraged O'Cahan to leave Rose and return to his first wife.[11] Montgomery wrote to Chichester on 4 March 1607: "the breach between [O'Cahan] and his landlord [the Earl of Tyrone] will be the greater by means of [the Earl's] daughter, his reputed wife, whom he has resolved to leave, having a former wife lawfully married to him."[7] O'Cahan later repudiated his marriage to Rose.[12]
In September 1607 Tyrone and other earls fled the country; the same month, O'Cahan was knighted.[1] Other sources say he was knighted in June.[13]
In early 1608, O'Cahan's brother joined the rebellion of Cahir O'Doherty, and although O'Cahan was not officially implicated, he was suspected of having knowledge of the uprising. He was arrested but never tried.[1] The antiquarian Francis Joseph Bigger has suggested that he was rumoured to have attempted flight with Tyrone and the other rebel lords, and had only been prevented from doing so by an "accidental delay in crossing some ferry on the road".[2] In the vent, O'Cahan remained in Limavady Castle following Tyrone's flight.[14] Sir Arthur Chichester—the Crown's Lord Deputy in Ulster—reasoned, says Bigger, that this indicated not only his sympathy for the rebels but mens rea also.[2] This was compounded by the fact that, in English eyes, O'Cahan "had become troublesome, and almost unmanageable of late, so, everything considered, it was thought best to take him also into special keeping at Dublin Castle".[15] Bigger notes that, although O'Cahan had remained loyal to his liege lord throughout the latter's seven-year campaign at the Crown, in 1608 he joined the major English statesman and commander in Ireland, Henry Docwra, on condition that O'Cahan would receive sufficient grants and lands to enable him to establish himself independently of Tyrone, and would no longer hold his estates in fief.[5]
O'Cahan's arrangement with Docwra regarding his lands was agreed to by the government, but Chichester managed to persuade the government to repudiate the deal. O'Cahan, says Bigger, went "frantic": his behaviour allowed Chichester to claim that O'Cahan had spoken and acted treasonably.[5] O'Cahan was arrested in 1608[7] and spent the rest of his life imprisoned in the Tower of London,[16] dying there around 1626.[1] During his imprisonment, the Plantation of Ulster continued westwards. However, his legal title to the Bann−Foyle region was not contested and, even though O'Cahan was never to return, no individual planter ever laid claim to his estate.[17]
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