I have been impressed by the similar depiction of the two saints here; first, St John Chrysostom, from the Byzantine collection of Dumbarton Oaks:
and then St Cyril of Alexandria, in an image taken from Wikipedia, though apparently the original image is in Chora, here in Istanbul. (I visited Chora once, maybe 14 years ago, but hope to visit again soon.)
I was originally impressed by how the blue and red crosses of the vestments of Chrysostom were repeated in his halo; then I happened upon the image of Cyril, with crosses similar in form, though not color, again repeated about the head.
Polytropy 
