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 Down, which saw Congal slain by High King Domnall mac Áedo of the Northern Uí Néill and resulted in Dál Riata losing possession of its Scottish lands. The Annals of Ulster record that in 668, the battle of Bellum Fertsi (modern-day Belfast) took place between the Ulaid and Cruithin, 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 and in 681, Dúngal Eilni, king of the Dál nAraidi, and his ally Cenn Fáelad of Ciannachta were killed at Dún Cethirinn. 8th to 10th centuries By the 8th century the territory of the Ulaid shrunk to east of the Bann into what is now the modern-day counties Antrim, Down and Louth. In either 732 or 735, the Ulaid suffered a heavy defeat at the hands of the Cenél nEógain led by Áed Allán in the battle of Fochart in Magh Muirthemne, which saw the king of Ulaid, Áed Róin, decapitated. As a result, the Cenél nEógain brought Conaille Muirthemne under their suzerainty. The taking over of the Ulaid's ancestral lands by first the Northern Uí Néill and the end of their glory led to a constant antagonism between them. It was in the 8th century that the kingdom of Dál Riata was overrun by the Dál nAraidi. The Dál Fiatach dynasty held sway over Ulaid until the battle of Leth Cam in 827, when they attempted to remove Airgíalla from Northern Uí Néill dominance. The Dál Fiatach may have been distracted by the presence of at least one Viking base along Strangford Lough, and by the end of the century, the Dál nAraidi had risen to dominance over them. However, this only lasted until 972, when Eochaid mac Ardgail restored Dál Fiatach's fortunes. During the 9th and 10th centuries, the Vikings had founded several bases in Ulaid, primarily at Annagassan, Carlingford Lough, Lough Neagh, and Strangford Lough. There was also a significant port at Ulfreksfjord, located at Latharna, present-day Larne, County Antrim. All but Ulfreksfjord were destroyed by