From the Annals of the Four Masters, Vol 6 pgs 1980-81. The Family of MacDevitt. The MacDevitts of Irishowen, in the north of Donegal, were, according to the historian Cucogry O'Cleary, a branch of the O'Donertys, Lords of Irishowen (descended from David O'Doherty, 1208. whence MacDavid, in Irish MacDaucid, now McDevitt). From the exploits of the famour Feilim Riahac MacDaucid (meaning the swarthy), one of the most valiant participants in the war against the English armies of Queen Elizabeth, in burning the town of Derry against them, the MacDevitts, who are at present a very numerous sept in the neighborhood of Londonderry, are even to this day called "Burn Derrys" by their Scottis or Presbyterian neighbors. There is much more in these Annals- Also check out O'Hart's Irish Pedigrees, Pg 223, The History of the Irish Church by Rev. Thos.Walsh, Pg 755. The MacDevitt Arms: Argent, a deer rampant gules, on a chief vert three mullets argent; crest, a hound courant argent.