The four pendentives of the dome in the Hagia Sofia each have a mosaic of a six winged seraph. The story is that since the dome is obviously supernatural, angels were required to help support it.
The four pendentives of the dome in the Hagia Sofia each have a mosaic of a six winged seraph. The story is that since the dome is obviously supernatural, angels were required to help support it. © Julian Fong, CC BY-SA 2.0, via Wikimedia Commons

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