Diarmait mac Ruaidrí Ó Conchobair, Prince of Connacht, died 1221.
Connacht  or Connaught (Irish: "Connacht" or "Cúige Chonnacht") is one of the provinces of Ireland, situated in the west of the country.
 Up to the 9th century it consisted of several independent major kingdoms (Lúighne, Uí Maine, and Iarthar Connacht).
The Battle of Lough Raska (Irish: "Loch Rasca" ) or Battle of Corcomroe (Irish: "Corca Mrua" ) took place on 15 August 1317 near Corcomroe Abbey in north County Clare, Ireland.
 It was part of a fight for control of the Uí Briain chieftaincy and part of the Anglo-Norman wars in Ireland.
 Forces loyal to Muircheartach Ó Briain were commanded by Diarmait Ó Briain in a pitched battle against Donnchadh Ó Briain, who was an ally of Mathghamhain Ó Briain and Richard de Clare.
 Both armies were about 9,000 men each.
 Diarmait Ó Briain's forces were victorious.
 This would be a precursor to the Battle of Dysert O'Dea.
Fedlim Geancach Ó Conchobair (Feidhlimidh Gheangcaigh mac Toirdhealbhaigh Óig Ó Conchobhair Donn) (died 1474), was one of the sons of Toirdhealbhach Óg Donn Ó Conchobair and King of Connacht from 1461–1475.
 Fedlim Geancach Ó Conchobair succeeded to the throne of the Connachta in 1461 after the death of Aedh mac Tairdelbach Óg Ó Conchobair.
 Fedlim was the last fully recognized monarch of The Kingdom of Connacht.
Aedh mac Tairdelbach Óg Ó Conchobair (died 15 May 1461), was one of the sons of Toirdhealbhach Óg Donn Ó Conchobair and King of Connacht from 1439–1461.
 Aedh Ó Conchobair succeeded to the throne of the Connachta in 1439 after the death of Cathal mac Ruaidri Ó Conchobair and was succeeded by Fedlim Ó Conchobair, also a son of Toirdhealbhach Óg Donn Ó Conchobair.
Cathal mac Ruaidri Ó Conchobair (died 9 December 1406).
 Few single members of the Ó Conchobair dynasty were able to assume overall control of the three main clan septs after the 1380s.
 Toirdhealbhach was one of the very last of the kings, who were by now reduced to their ancestral lands in County Roscommon.
In 1167, Diarmait Mac Murchada had been deposed as King of Leinster (Irish: "Laighin" ) and exiled from Ireland by the High King of Ireland, Ruaidrí Ua Conchobair and his ally Tigernán Ua Ruairc.
 Diarmait was determined to regain his kingdom and become High King himself.
 He fled to France and asked for military aid from the Anglo-Norman King of England, Henry II.
 Henry authorized Diarmait to seek help from the Anglo-Norman and Cambro-Norman lords in his kingdom.
 Those who agreed to help included Richard de Clare (nicknamed "Strongbow") and half-brothers Robert Fitz-Stephen and Maurice FitzGerald.
 Fitz-Stephan was accompanied by his half-nephew Robert de Barry.
 Strongbow was offered Diarmait's daughter Aoife in marriage and promised the kingship of Leinster on Diarmait's death.
 Robert and Maurice were promised lands inf Wexford and elsewhere for their services.
Diarmait Mac Murchada (Modern Irish: Diarmaid Mac Murchadha), anglicised as Dermot MacMurrough, Dermod MacMurrough, Dermot MacMorrogh or Dermot MacMorrow (c. 1110c. 1 May 1171), was a King of Leinster in Ireland.
 In 1167, he was 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 solicited help from King Henry II of England.
 In return, Mac Murchada pledged an oath of allegiance to Henry, who sent troops in support.
 As a further thanks for his reinstatement, Mac Murchada's daughter Aoife was married to Richard de Clare, the 2nd Earl of Pembroke (nicknamed "Strongbow").
 Henry II then mounted a larger second invasion in 1171 to ensure his control over Strongbow, resulting in the Lordship of Ireland.
 Mac Murchada was later known as Diarmait na nGall (Irish for "Diarmait of the Foreigners").
Aedh mac Aedh Breifneach Ua Conchobair was king of Connacht in 1342.
 He was the last of the Clan Muircheartaigh Uí Conchobhair to hold this position.
 He died in 1350, as the "Ó Conchobar Brefnech", some eight years after being expelled.
 His father, a son of Cathal Ruadh Ó Conchobair had briefly made a bid for the kingship in 1309-10 from a power-base established in Bréifne Ó Ruairc.
Toirdelbach mac Ruaidhi Ó Conchobair, Prince of Connacht, died 1239.

Question:  Diarmait Ó Conchobair was Prince of a province in what country?
Answer: Ireland