In Liber Munerum it is recorded that in 1710 the parishes of Cahersilton, Ballymartyr and Mogeely were to be united under the name of Castlemartyr.

A new church was completed in 1730, built on ground conveyed by Henry Boyle (a speaker of the Irish House of Commons, later Earl of Shannon, Viscount Boyle of Bandon and Baron of Castlemartyr). The church was consecrated in 1731 and replaced an old parish building first constructed in 1549 that had been destroyed in the war of 1641. In 1960 the parish was united to Midleton and in 1978 in was united to Youghal.

Sadly, nothing else is known about the history of Castlemartyr, as parish records were burnt in the Four Courts fire in Dublin in 1922.

St. Ann's in a fine example of a sparse Georgian preaching house in a relatively small, rural community. It is situated on an elevated spot, just off the main street of the Village. Its Avenue is flanked by mature trees leading to the church and tower.