The parish was established in 1689, and was transferred from the diocese of Chester to the diocese of St Asaph in 1849. Both Browne Willis and A.W. Wade-Evans agree on the dedication of the church to Deiniol, although there is no known evidence for it prior to the eighteenth century.

The dedication is given as Dinoth (Dunawd) in Browne Willis' earlier Survey of the Cathedral Church of Bangor and the Edifices Belonging to it (1721), underlying the possession of the church by Bangor-on-Dee.