Llandaff Cathedral (Welsh: Eglwys Gadeiriol Llandaf) is a Church in Wales cathedral and parish church in Llandaff, Cardiff, Wales. It was built in the 12th-century on the site of an earlier church.
It is dedicated to Saint Peter and Saint Paul, and three Welsh saints: Dubricius (Welsh: Dyfrig), Teilo and Oudoceus (Welsh: Euddogwy).