Muirchertach Ceannfada O'Neill
In 1354 his forces along with the English inflicted a heavy defeat on Áed Remar O'Neill, king of Tyrone.[1] It was during Muirchertach's reign that the Clandeboye O'Neills seem to have come into possession of large tracts of land in modern-day County Antrim, Northern Ireland.In 1359 O'Neill's uncle Hugh killed the tanist of Uí Tuirtre, Murtagh O'Lynn.Another son, Henry Caoach O'Neill, would unsuccessfully contend for the lordship after Brian's death in 1425.[4] O'Neill's nickname ceannfada (English: "Kennedy") meant long-headed or prudent.