The Northern Uí Néill remained outside of Norman control, eventually absorbing the greater part of Airgíalla, which had by the end of the 12th century lost its eastern territory (afterwards known as "English Oriel" and later as Louth) to the Normans. Airgíalla would eventually no longer be reckoned an over-kingdom however it survived in present-day County Monaghan for as long as the Gaelic order survived, with the last king of Airgíalla being Hugh Roe McMahon, who reigned from 1589 until his execution in September/October 1590.