Derbforgaill

Dearbhfhorghaill , anglicized as Derval, was a daughter of Murchad Ua Maeleachlainn, king of Meath, and of his wife Mor , daughter of Muirchertach Ua Briain. She is famously known as the Helen of Ireland as her abduction from her husband Tigernn Ua Ruairc by Diarmait Mac Murchada, king of Leinster, in 1152 played some part in bringing the AngloNormans to Irish shores, although this is a role that has often been greatly exaggerated and often misinterpreted.

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Source: Wikipedia