The oscillation of the centre of power between Meath and Tir Eogain, according as the ardri belonged to the southern or northern Hy Neill, produced corresponding perturbations in the balance of parties among the minor kings.
The name Tir Eogain later became associated with south Ulster where it survives in the county name Tyrone.
For instance, Ailech might be resolved into Tir Conaill and Tir Eogain according to political conditions.
Recent bracken clearing will allow a more natural heathland habitat to emerge, which will be enhanced further under Tir Gofal.
