Diarmait Mac Murchada

Diarmait Mac Murchada (Modern Irish: Diarmaid Mac Murchadha), anglicised as Dermot MacMurrough, Dermod MacMurrough, Dermot MacMorrogh or Dermot MacMorrow (c. 1110 – c. 1 May 1171), is a King of Leinster in Ireland.

In 1167, he is deprived of his kingdom by the High King of Ireland—Ruaidri Ua Conchobair.

The grounds for the dispossession were that Mac Murchada had, in 1152, abducted Derbforgaill, the wife of the King of Breifne, Tiernan O'Rourke (Irish: Tighearnán Ua Ruairc).

To recover his kingdom, Mac Murchada solicits help from King Henry II of England.

In return, Mac Murchada pledges an oath of allegiance to Henry, who sends troops in support.

As a further thanks for his reinstatement, Mac Murchada's daughter Aoife is married to Richard de Clare, the 2nd Earl of Pembroke (nicknamed "Strongbow").

Henry II now mounts a larger second invasion in 1171 to ensure his control over Strongbow, resulting in the Lordship of Ireland.

Mac Murchada is later known as Diarmait na nGall (Irish for "Diarmait of the Foreigners").

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