evidence: It appears to have been the intention of the Cenél nEógain to allow Viking strongholds to survive further south in Ulaid territory at Strangford Lough and Carlingford, and later on also at Ruib Mena on Lough Neagh. However, these longphuirt too were eventually destroyed by the Irish of the north of Ireland, the final ones in a spiral of violence that surrounded the death of the famous king of Aileach, Muirchertach of the Leather Cloaks, who was killed by the Vikings in 943.