Set in a peaceful, scenic conservation zone on the bank of the River Taff, Llandaff Cathedral is one of two cathedrals in Cardiff, the seat of the Bishop of Llandaff, covering the South Wales diocese. While the present-day structure dates from early in the 12th Century, the cathedral actually stands on one of the oldest sites in British Christian history, settled by St. Dyfrig in the 6th Century.