The Northern Uí Néill is the name given to several dynasties in north-western medieval Ireland that claimed descent from a common ancestor, Niall of the Nine Hostages. Other dynasties in central and eastern Ireland who also claimed descent from Niall were termed the Southern Uí Néill (together they are known as the Uí Néill dynasty). The dynasties of the Northern Uí Néill were the Cenél Conaill and Cenél nEógain, named after supposed sons of Niall: Conall and Eógain.