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Illustration depicts a sighting by two Dutch ships in the North Sea of an object moving slowly in the sky. It appeared to be made by two disks of different size. The source for this account is one of the books entitled Theatrum Orbis Terrarum by Admiral Blaeu. These books were compilations of articles by different authors and consisted of detailed accounts of long engagements at sea, cartography information.
UFO's have been depicted in art during the Renaissance also going back thousands of years. Were these unrelated artists Ancient Alien enthusiasts, did they have secret knowledge, or were they also trying to depict something they did not quite understand?
"The Miracle of the Snow" by Masolino Da Panicale circa 1400 from Florence, Italy in the Church of Santa Maria Maggiore, depicting Jesus and Mary on very non vaporous "lenticular clouds" (flat and circular), or accompanied by an armada of flying saucers stretching beyond the horizon.