Donegal Studies - History of Donegal - Doherty

Dohertys [Uí Dochartaigh] also known as Clann Fiamhain
Like the O'Donnells, the Dohertys were a branch of the Cenal Chonaill, tracing their descent from a man called Dochartach. This name is often translated as 'Destroyer' and according to Doherty genealogies, he was ninth in descent from Conall Gulban, son of Niall Noigiallach [Niall of the Nine Hostages]. Thus although nowadays associated with the peninsula of Inishowen, they claim descent not from Cenel Eoghain but from the rival Cenel Chonaill.
The annals first mention the surname in 1180AD, and not long after, in 1197, Echmarcach Ó Dochartaigh gained the kingship of Tír Chonaill, breaking the long hold of the O'Cannon and Mulderry families, but only for a short time as he was killed resisting the Norman raids of John de Courcey. The stronghold of the family appears to have been in East Donegal, between modern day Letterkenny and Lifford, and in the area along the river Finn. It would be another century and a half before the Dohertys had control of Inishowen, following firstly the decline of the Mac Lochlainns and then of Norman rule in the peninsula, centred on their massive de Burgo castle in Greencastle.
Conchobhar an Einigh Ó Dochartaigh was the first of the name to be called the lord of Inishowen, when he died in 1413. Inishowen, as part of the Cenel Eoghain lands, was a disputed territory. By the end of the fiteenth centry the annals record the Doherty lords of Inishowen as being subject to the O'Donnells, while soon after, in 1511, Art Ó Néill, lord of Tír Eoghain plundered the peninsula. Aodh mac Aoidh Ruaidh, lord of Tír Chonaill, could not let this pass, and after his forces defeated those of Tír Eoghain on a number of occasions between 1512 and 1522, the overlordship of the O'Donnells was recognised. Indeed in the annals Ó Dochartaigh is listed as a loyal follower of Ó Domhnaill, along with Ó Baoighill, Mac Suibhne and Ó Gallchobhair. As soon as O'Donnell power began to wane, however, the Dohertys sought to consolidate their own position. In 1606 Cathaoir Ó Dochartaigh was accused of rebelling against the English governor of Derry, Henry Docwra. He denied this, and to show his loyalty served on the jury which indicted the Gaelic earls who had fled from Rathmullan in 1607. In 1608 his forces burned Derry, and for this he was pursued deep into Tír Chonaill and killed near Kilmacrennan. This was the end of the Doherty lordship.
The family is still very numerous in Donegal, and especially in Inishowen, where, because they are so strong, many families are known by nicknames to distinguish them from other Dohertys. The line of the ruling family lives on, and as recently as 1989 a Ramon Ó Dochartaigh, who lives in Cadiz in Spain, was recognised by the Office of the Cheif Herald of Ireland as the head of the family. He claims descent from a brother of Cathaoir Ó Dochartaigh. This Sean Ó Dochartaigh did not flee along with the O'Donnells and O'Neills, however; it was in the late 18th century that a John Doherty went to Spain along with his two brothers. John took up a career in the Spanish Navy, the successor to the Armada which had come to grief two centuries earlier on the coast of his native Inishowen.