A wall mural, or fresco, from 1350, “The Crucifixion,” artist unknown, in the Visoki Decani Monestary in Kosovo, Serbia. Two odd-looking objects with “pilots” can be seen in the sky on both sides of Jesus.
UFOs in painting
https://www.huffingtonpost.com/entry/ufos-in-renaissance-art_us_5679991de4b014efe0d7044b