It was designated as a Grade II* listed building on 14 February 1967.

Located on Church Island near Menai Bridge, St Tysilio's Church is dedicated to Saint Tysilio, who was renowned for establishing a sanctuary on Ynys Suliau (also known as Ynys Tysilio).

It was designated as a Grade II* listed building on 14 February 1967.

[1] There are a some World War One graves located in the church yard.

[2] Welsh war poet and dramatist Sir Albert Evans-Jones (Bardic name Cynan) (1895–1970) is buried in the churchyard.