King of Ireland, Suibne Menn of the Northern Uí Néill in battle. In 629, Congal led the Dál nAraidi to defeat against the same foes. In an attempt to have himself installed as High King of Ireland, Congal made alliances with Dál Riata and Strathclyde, which resulted in the disastrous Battle of Moira in 637, in modern-day County Antrim, which saw Congal slain by High King Domnall mac Áedo of the Northern Uí Néill and severely weakened both Dál nAraidi and Dál Riata. The Annals of Ulster record that in 668, the battle of Bellum Fertsi (modern-day Belfast) took place between the Ulaid and Cruthin, both terms which then referred to the Dál Fiatach and Dál nAraide respectively. Meanwhile, the Dál nAraidi where still resisting the encroaching Northern Uí Néill. In 681, the Dál nAraidi led by Dúngal Eilni of the In Tuasicirt branch, along with their allies, the Cianachta Glenn Geimin of northern County Londonderry led by Cenn Fáelad, were killed at Dún Cethirinn by Máel Dúin mac Máele Fithrich of the Cenél Meic Ercae of Cenél nEógain. Some form of combination of the Dál nAraidi, the Cianachta Glenn Geimin and the Cenél Feradaig was suspected of involvement in the death of Eochaid mac Domangairt, king of the Cenél nGabráin of Scottish Dál Riata in 697. Throughout the 7th century, the Cruthin had gradually lost their lands west of the River Bann, allowing Dál nAraidi to become the sole Cruthin dynastic grouping in County Antrim. After 776, the annals no longer refer to the Dál nAraidi as being of Cruthin stock, but to be of the Ulaid population-grouping instead, being called the fir-Ulaid, the "men of Ulster". In the 8th century the kingdom of Dál Riata was overrun by the Dál nAraidi. Concurrently the Dál Fiatach extended their territory cutting off the Dál nAraidi from the Uí Echach Cobo. By the end of the 9th century the Dál nAraidi had taken control of Ulaid from the Dál Fiatach. This however only lasted until 972, when Eochaid mac Ardgail restored Dál Fiatach's dominance. In 1005, Brian Boru, marched north to accept submissions from the Ulaid, which including marching upon the Dál nAraidi capital Ráith Mór where he received only the submissions of their king. By the beginning of the 12th century the Dál nAraidi, ruled by the Ó Loingsigh (O'Lynch), had lost control of most of Antrim to the Uí