Issui was an early
Welsh saint who lived by the well next to the site of the church. Following his murder, the well became a place of
pilgrimage and the church was founded with the offerings of pilgrims in 1060.
Gerald of Wales is reputed to have preached at the church in 1188 while on his tour of Wales. The church was undamaged during the
Reformation, the dual
altars being spared by the order of
Edward VI in 1550. The church similarly escaped any large-scale
Victorian reconstruction and was carefully restored by
W. D. Caröe in 1908–1909. The church remains an active church in the
parish of the Vale of Grwyne. ==Architecture and description==