|Shield sighting from Annales Laurissense|
The question doesn't end in the Dark Ages though several sightings during the period, in a heightened time of unrest and violence, do have similar descriptive terms. Fire in the sky burning and spinning. Revolving wheel or round barrel of flame. Long fiery beam, pile of fire the size of a small boat, dark object making a sound like a wheel, shaped like a drum and came from the sea. The execution of Nichiren, for example, was aborted as the executioner panicked and ran when he witnessed an object in the sky like a full moon suddenly appear. As well, the Japanese are first credited to the term "flying saucer" after a sighting in 1180CE describing a flying earthenware vessel leaving a luminous trail. As time traces further back, descriptions tend to remain similar in style but use different terms such as a flying globe of fire and circular shield in the sky. Even so far back into written history around 1450BCE where the annals of Thutmose III talking of circles of fire coming from the sky brighter than the brightness of the sun.
Of course one could easily attribute the more ancient UFO sightings to be nothing more than meteorites crashing to Earth, which do indeed fit the some descriptions. Celestial body movements and falling stars best explain a few of the accounts, but do not provide an accurate explanation for other events like the Nuremberg sky battle in which it's reported the objects were fighting with each other, so evident the onlookers could tell who was winning and who was losing. Another example is an account from Emperor Theodosius around 390CE describing a brilliant glowing orb in the sky with a great number of other glowing orbs drawing near the larger one, almost as if they were being pulled in. Theodosius claimed the spectacle to be like a swarm of bees flying around a bee-keeper until they blended together as one, becoming as bright to the eye as a double-edged sword. In fact, there are quite a few ancient UFO sightings that dismiss the comet or meteor theory altogether due to the irregular activity of the object, moving in such ways that a meteor is not capable of.