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Trinity College (Irish: Coláiste na Tríonóide), officially The Provost, Fellows, Foundation Scholars and the other members of Board, of the College of the Holy and Undivided Trinity of Queen Elizabeth near Dublin, is the sole constituent college of the University of Dublin, a research university in Dublin, Ireland. Queen Elizabeth I founded the college in 1592 as "the mother of a university" that was modelled after the collegiate universities of Oxford and Cambridge, but unlike these affiliated institutions, only one college was ever established; as such, the designations "Trinity College" and "University of Dublin" are usually synonymous for practical purposes.

University College Cork – National University of Ireland, Cork (UCC) (Irish: Coláiste na hOllscoile Corcaigh) is a constituent university of the National University of Ireland, and located in Cork.

University College Dublin (commonly referred to as UCD; Irish: Coláiste na hOllscoile, Baile Átha Cliath) is a public research university in Dublin, Ireland, and a member institution of the National University of Ireland. With 33,284 students, it is Ireland's largest university, and amongst the most prestigious universities in the country. Five Nobel Laureates are among UCD's alumni and current and former staff.

The University of Limerick (UL) (Irish: Ollscoil Luimnigh) is a public research university institution in Limerick, Ireland. Founded in 1972 as the National Institute for Higher Education, Limerick, it became a university in September 1989 in accordance with the University of Limerick Act 1989. It was the first university established since Irish independence in 1922, followed by the establishment of Dublin City University later the same day.