PICTS AND COPTS in contact in late anquity? So says Magnus Linklater in the London Times:

Around the 6th century, the Picts converted to Christianity and some of their carvings show links with the Middle Eastern Coptic church. This image (left), of two hands receiving a loaf of bread from a raven, depicts StAnthony and StPaul the Hermit in the desert. It is found on a monastery wall in Egypt and a Pictish stone at St Vigeans, Dundee.

Unfortunately the online article has no image.