I didn;t knew about this work of art. So nice!
Hagia Sophia Angel Face sees the light again
Here is a picture I have found and more links to coverage on this interesting mosaic. The cathedral's Christian mosaics were covered up in line with Muslim custom shortly after Constantinople — the former name for Istanbul — fell to the Ottomans in 1453 and the cathedral was turned into a mosque. Mosaics truly can stand the test of time.
