abduction and Mac Murchada's expulsion from Leinster, several sources attribute Ua Ruairc's role in Mac Murchada's expulsion to a desire for revenge for the kidknapping of Derbforgaill. Mac Murchadh fled to the court of Henry II of England in Aquitaine, where he asked Henry for help in regaining his territory in Leinster. Henry agreed to allow Mac Murchada to recruit mercenary soldiers from amongst his subjects. He ultimately persuaded Richard de Clare, 2nd Earl of Pembroke, known as Strongbow, to assist him, promising the inheritance of Leinster in return. He initially returned to Leinster in 1167 with a small band of Norman knights and was defeated by Ruaidhrí Ua Conchobair, Ua Ruairc and Ua Maelseachlainn. On this occasion he was allowed to remain in Ireland, but was forced to pay one hundred ounces of gold to Ua Ruairc for the kidnapping of Derbforgaill (thus proving under Brehon law that the abduction of his wife was unlawful) and submit and give hostages to Ruaidhrí. It wasn't until the arrival of Robert Fitz Stephen, Hervey de Montmorency, Raymond le Gros and eventually Strongbow himself that Mac Murchada met with success. Ua Ruairc had his territories in Meath plundered by Mac Murchada and Strongbow in 1170. In response, the Annals of Tigernach state that he persuaded Ruaidhrí Ua Conchobair to execute hostages he had taken from Mac Murchada the previous year. In 1171 he joined Ruaidhrí in an unsuccessful siege of Dublin, which had by then been captured by Mac Murchada and Strongbow. He raided the territory around Dublin later in the year, unsuccessfully engaging the Normans stationed there under Miles De Cogan. In this engagement, his son, Aodh, was killed. According to Giraldus Cambrensis, Ua Ruairc was one of the Kings of Ireland who submitted allegiance to Henry II after his arrival to assert control over Strongbow in 1171. Death According to Giraldus Cambrensis, Ua Ruairc was killed at a parley on the Hill of Tlachtga by a Cambro-Norman knight named Griffin FitzWilliam, acting in defence of Hugh de Lacy and Maurice FitzGerald, whom Giraldus claims Ua Ruairc attempted to kill after failed negotiations. This occurred shortly after the departure of Henry II from Ireland. However, the Annals of Tigernach indicate that he was betrayed and killed by Eoan Mer, Richard de Clare the Younger, a son of Strongbow, and Domhnall, a son of Annach Ua Ruairc in 1172. The Annals of