There has been evidence of a church in Northop since the 6th century. It is said that Eurgain, a niece of Saint Asaph, passed through Northop and founded the church here on a Celtic mound, upon which it still stands. The Welsh placename for Northop, "Llaneurgain" translates as "The holy enclosure of Eurgain". Records indicate that there was a stone church erected here during the 12th century, with the tower being completed to its 98-foot height in 1571. The present building was extensively rebuilt during 1840, with further alterations being carried out in 1877.