The tower was originally on the riverfront, but when the Blackwater River silted up and changed course in the 17th–18th centuries, it was left 220 m (240 yd) from the water.

[7][8][9] Oliver Cromwell's army entered Youghal in 1649 during the Cromwellian conquest of Ireland; it is assumed that it was used to quarter Parliamentarian soldiers.

In 1689, during the reign of King James II, it was used as a prison for Cromwell supporters and an attempt was made to burn it down.

[10] The castle remained with the Tyntes until it was sold in 1866 to William Raymond FitzMaurice, a wealthy Anglo-Irish landowner.

[12] There are large windows in the west wall topped with brick arches; these were probably added in the 19th century when the castle was used as a granary.