St Patrick's Cathedral, Dublin
Saint Patrick's Cathedral () in Dublin, Ireland, founded in 1191, is the National Cathedral of the Church of Ireland. With its spire, St. Patrick's is the tallest church (not Cathedral) in Ireland and the largest. Christ Church Cathedral, also a Church of Ireland cathedral in Dublin, is designated as the local Cathedral of the diocese of Dublin and Glendalough.
Armagh
Armagh is the site of two cathedrals, both on hills and both named after Saint Patrick. The Church of Ireland cathedral dates back to around 445. The present-day, post-Reformation, Roman Catholic cathedral was constructed during the latter half of the 19th century and features twin 64m spires, making it the tallest such structure in the county. Armagh is one of the few cities in the world which is home to two cathedrals of the same name.