Thanks for all the replies. The fresco is from "Sphinx: Geheimnisse der Geschichte" (secrets of history), the companion book to an early 90ties german tv documentary series spanning from the king minos over Hannibal, Cleopatra and the huns to the lost amber room. The author date it to the 5th century AD and claims it is from an eyewitness of the wars with the huns. The book isn't very sorrowly researched and there are quite a lot errors and inaccuracies in it, especially in the hun chapter. Thus probably their dating is onyl speculation because they needed something like this.
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