Henry II of England converted the whole country of Ireland to Catholicism with the help of Dermot MacMurrough (deposed king of Leinster province, seen by nationalist Irish as a traitor) and Strongbow (the alias of Richard de Clare, Second Earl of Pembroke, a Norman lord who led the Norman invasions). Pope Alexander III gave assent to Henry II’s rule over Ireland following this.
Hey! How dare you destroy the mythology if an "indigenous pipple?"
You have your facts wrong. Ireland was completely Christian from the 5th century, although there were some regions that were temporarily pagan as a result of the Viking invasions. Ireland was Catholic for over 500 years before Henry II was even born.
Henry II sought and received permission to extend the Norman invasion to a then independent Ireland from the English Pope Adrian IV in 1155. The Norman Invasion of Ireland began in 1169 under Pope Alexander III and Maurice Fitzgerald. This was expanded a year later by a stronger force under Richard de Clare, 2nd Earl of Pembroke, in 1170, the year St. Thomas Beckett was martyred by the very folks you claim brought Catholicism to Ireland.
Peace be with you