"little of what was once thought distinctive about the nature of the church in Celtic lands is any longer accepted"

University of Glasgow

"The idea of a Celtic church has its roots in the Reformation.  For Protestants, the early Celtic saints embodied evangelical purity and a church wholly independent of Rome; the Reformation represented a return to the values of the indigenous British Christianity of a golden age.  This interpretation came to dominate historical perceptions in the succeeding centuries, and from it was born, in the 19th century, the concept of the 'Celtic church'. . . . [But] The concept of the Celtic church can no longer easily be defended. . . .  little of what was once thought distinctive about the nature of the church in Celtic lands is any longer accepted. . . .  All this being said, we may nevertheless notice a number of striking common features among the churches of the Celtic peoples. . . ."

     John Reuben Davies, Oxford dictionary of the Middle Ages, sv Celtic church (vol. 1 (2010), pp. 358-359, with starter bibliography).