Baron Kerry is an ancient title in the Peerage of Ireland named after County Kerry. It was created circa 1223 for Thomas FitzMaurice, Lord OConnello. In 1325, , murdered Diarmaid Óg MacCarthy (son of Cormac Mór MacCarthy) in the courtroom at Tralee. For this act, Maurice was tried and attainted by the parliament in Dublin and his lands forfeited, but after his death they were restored to his brother John FitzMaurice, 5th Baron of Kerry.