the combined efforts of the Ulaid and the Northern Uí Néill, however as a result they deprived themselves of the economic advantages provided by prosperous Viking settlements. 11th century In 1000 the Viking king of Dublin, Sigtrygg Silkbeard, was expelled by Brian Boru the High King of Ireland, and was refused sanctuary by the Ulaid. Eventually Sigtrygg was forced to return to Dublin and submitted to Brian. Sigtrygg didn't forget the Ulaid's refusal, and in 1001 his fleet plundered Inis Cumhscraigh and Cill Cleithe in Dál Fiatach, taking many prisoners. Sigtrygg's forces also served in Brian's campaigns against the Ulaid in 1002 and 1005. At Craeb Telcha in 1003 the Northern Uí Néill and Ulaid fought a major battle, the Ulaid inauguration site. Here Eochaid mac Ardgail, and most of Ulaid's nobility were slaughtered, along with the Northern Uí Néill king. The result was a bloody succession war amongst the princes of the Dál Fiatach, who also had to war with the Dál nAraidi who eyed the kingship. In 1005, Brian Boru, marched north to accept submissions from the Ulaid, and set-up camp at Emain Macha possibly with the intention of exploiting the symbolism it held for the Ulaid. From here, Boru marched to the Dál nAraidi capital, Ráith Mór, where he received only the submissions of their king and that of the Dál Fiatach. This however appears to have been the catalyst for a series of attacks by Flaithbertach Ua Néill, king of the Cenél nEógain, to punish the Ulaid. In 1006, an army led by Flaithbertach marched into Leth Cathail and killed its king, followed by the slaying of the heir of Uí Echach Cobo at Loughbrickland. The battle of Craeb Telcha resulted in the inability of the Ulaid to provide any useful aid to Boru, when in 1006 he led an army made up of men from all over Ireland in an attempt to force the submission of the Northern Uí Néill. Having marched through the lands of the Cenél Conaill and Cenél nEógain, Boru led his army across the River Bann at Fersat Camsa (Macosquin) and into Ulaid, where he accepted submissions from the Ulaid at Craeb Telcha, before marching south and through the traditional assembly place of the Conaille Muirtheimne at i n-oenach Conaille. Flaithbertach Ua Néill continued his attacks on Ulaid in 1007, attacking the Conaille Muirtheimne. In 1011, the same year Boru finally