In the ~9th century account of the death of king Conchabhar mac Nessa of Ulster (Northern Ireland), a great earthquake is observed. The Druid at hand tells the king that the reason for the “trembling of heaven and earth” is the death of Jesus Christ the Son of the Living God, at the hands of the Jews. It then comments that Conchabhar was one of only two individuals in Ireland (the other being the wise judge Morann) to believe in the one true God before the coming of Christianity centuries later.
Now, one could say quite easily that this is obviously a later addition and embellishment on a much older tale, but like much myth, it could contain a grain of truth. With the Magi, the birth of Christ was announced to pagan astrologers who then came to pay him homage. Could not his death also have been marked in such a way that other pagan priests might have taken notice?