Celtic Culture.

Yes, if it was a Celtic Christian saint, of he is. Christianity came to the British isles in the Celtic Era and there were many Celtic Christian Martyrs, who are called as saints.

The Book of Kells is often considered the greatest example of the fusion of Christianity and Celtic art. Created around the 8th or 9th century, it contains intricate illustrations and ornamentation that blend Christian themes with traditional Celtic designs.

Most often Celtic Spirituality is broadly based on a combination of Celtic Christianity and Celtic Folk Wisdom (which often springs from pre-Christian beliefs). It (Celtic Christianity) tends to view the world as a far more living/magical/mystical place with more reverence placed on Nature that run-of-the-mill Christianity tends to. The non-Christian form of Celtic Spirituality barrows heavily from Celtic Folk Wisdom and the New Age movement which, of course, finds its roots in Spiritualism and pre-Christian religion reconstruction(ism).

Christianity and Celtic myths.