The monastic hermitage of Desertmartin was originally dedicated to Saint Martin of Tours. The remains of the ancient parish church are in the townland of Knocknagin at the east side of the village.[2]
When County Coleraine was created in 1585, its administration was meant to be carried out in the town of Coleraine. However, the jail and courthouse were built in Desertmartin.[4][user-generated source?]
On 19 May 1922, during the Irish War of Independence, a mob of unionists and Ulster Special Constables attacked and burned many Catholic homes and businesses in Desertmartin, in revenge for the burning of a unionist-owned mill. Special Constables took four Catholic men from their homes outside the village and summarily executed them by the roadside.[5]
Religious buildings
St Patrick's, townland of Keenaght (Roman Catholic) (Old Chapel).
St Patrick's, townland of Keenaght (Roman Catholic) (New Chapel).
St. Mary's, townland of Annagh and Moneysterlin (Roman Catholic) Church and adjacent Parochial House are landmark buildings. It is commonly referred to as Coolcalm after the former townland of same name, which is now part of Annagh and Moneysterlin.
St Comgall’s Church of Ireland (Desertmartin Parish) is a visually and historically significant building and a local landmark. The church was built in 1821 and is a listed building. St Comgall’s Church is located on the Dromore Road in the village and looks out over the scenic Slieve Gallion mountain.