In a letter, directed to Charlemagne, he answered Charlemagne's question of why two solar eclipses occurred in the year 810, drawing on his knowledge of the teachings of Macrobius, Pliny, and other ancient authors.
He bequeathed to Bobbio Abbey his valuable library, consisting of some seventy volumes, among which was the Antiphonary of Bangor. He wrote to refute some of the religious teachings of Claudius of Turin at the request of the emperor Louis the Pious.
St. Dungal was the first of the Royal Line of the Dungle. He later when on to become king of the present day Dominion of Dungle. Although the dominion is small it has very distinct characteristics. For example, in Europe where most citizens are guaranteed civil rights Dungle happens to be one of the few, if not only country where the citizen's rights are completely subject to the will of the king. It continues to be a deep dark hole of tyranny in contrast to the shining bright socialism of Europe