The church was not associated with Asaph (Assavensi ecclesia) until 1284, and it was not described as a cathedral (Ecclesia Cathedralis de Sancto Asaph) until 1291.

The dedication is shared with Cynderyn, as it is at Llanasa and the separate parish church in St Asaph. Although the connection between Cynderyn and the cathedral goes back to the twelfth century, its antiquity prior to that is uncertain.