Religion has been an important part of Criccieth's life since early days, and around 1300 "St Catherine's Parish Church" was built on what is thought to be the site of an early religious foundation. As the town developed so did the church, and in 1500 an extra nave was added. The church was restored in 1869 by Henry Kennedy and Gustavus O'Donoghue of Bangor It contains wooden panelling made from old box pews and a communion table dating from the 17th century. On the wall is a list of rectors stretching back to 1301. In the graveyard, the oldest stone commemorates the death in 1688 of Robert Ellis who was "Groom of the Privy Chamber in Ordinarie" to Catarina de Bragança, the wife of Charles II. Outside the west door is a sundial dating from 1734 with distances to ports in all directions.