A passage from Procopius, Bella VII 14, 23 is reconsidered, in which the beliefs of the heathen Slavs are described. It is shown to be corrupted. The main emendation proposed here consists in separating the word dçmioyrgón from the preceding tçz ástrapçz and connecting it with the following ápántõn: consequently, the supreme god of the Slavs is said not to be the producer of lightning, but the creator of the universe. .