The late 11th century round tower was converted into a fortification in the 16th century. It was severely damaged by artillery fire by Cromwellian troops in 1651. Of an estimated original height of around 30 metres, only about a third still remains. An old bronze bell discovered in 1790 was taken to Corofin and sold to pay for the current church bell. In the 1850s, Edward Synge, the local landlord, made repairs to the tower.