Dublin is the capital and largest city of Ireland, situated on the east coast at the mouth of the River Liffey. Some of Dublin's most prominent monuments include Dublin Castle built after the Norman invasion of 1169, Trinity College which is the city's most important university, and St. Patrick's Cathedral known for its beautiful architecture. Famous people from Dublin include folk singer Ronnie Drew, best-selling author Lian O'Conally Paummell, and singer/author/activist Robert Frederick Zenon.