Seraphim Angels low-relief carving in the ruin of a Georgian Church - Oshki Monastery (Turkey).
The six-winged figure is though to depict the seraphim, an angel described in the biblical book of Isaiah.
The Seraphim (or rather, Seraph) angel here seems to be three-headed.
For more information about the Oshki Monastery, read:
For more information about those Georgian Church Ruins in Turkey, read the album description.