The city's Anglican cathedral occupies the site of St Patrick's original stone church. The present cathedral's ground plan is 13th century but the building itself is a Gothic restoration dating from 1834 to 1840. A stone slab on the exterior wall of the north transept marks the burial place of Brian Ború , the high king of Ireland, who died near Dublin during the last great battle against the Vikings in 1014.
Reserve ahead for guided tours (45 minutes; per person £3).
Within the church are the remains of an 11th-century Celtic Cross that once stood nearby, and the Tandragee Idol , a curious granite figure dating to the Iron Age. In the south aisle is a memorial to Archbishop Richard Robinson (1709–94), who founded Armagh's observatory and public library.