Behind his head are the two Greek letters chi and rho and that tells me at once who he is, because they're the first two letters of the word Christos, and this is in fact Christ.

在他头部后方还有两个希腊chirho, 这让们立这名男子的身份：这是希腊文christes的首，而们所看到的正是耶稣最早的图像之一。