Labhradh Laidech mac Bressal Belach

Labhradh, a brother of Eanna Niadh who is No. 92 on the "OToole" pedigree, was the ancestor of MacMuircha; anglicised MacMorough, MacMorrow, and Morrow.

MacMorough: The ancient kings of Leinster had fortresses or royal residences at Dinnrigh, near the river Barrow, between Carlow and Leighlin; at Naas, in Kildare; and in after-times at the city of Ferns in Wexford, which was their capital; and also at Old Ross in Wexford; and at Ballymoon in Carlow.

The MacMoroughs were inaugurated as kings of Leinster at a place called Cnoc-an-Bhogha , attended by O'Nolan, who was the King's Marshal, and Chief of Forth in Carlow; by O'Doran, Chief Brehon of Leinster; and by MacKeogh, his Chief Bard; and the MacMoroughs maintained their independence, and held the title of "Kings of Leinster," with large possesions in Wexford and Carlow down to the reign of Queen Elizabeth.

The Hy-Cavanagh or O'Cavanaghs were chiefs of the ancient territory which now comprises the barony of Idrone East, in the county Carlow; and in modern times became the representatives of the MacMoroughs, Kings of Leinster.

Irish Pedigrees; or, The Origin and Stem of the Irish Nation by John O'Hart (1915)