In addition to attempts to explain the legend of the Wawel Dragon simply as a symbol of evil, there might be some echoes of historical events. According to some historians, the dragon is a symbol of the presence of the Avars on Wawel Hill in the second half of the sixth century, and the victims devoured by the beast symbolise the tribute pulled by them. There are also attempts to interpret the story as a reference to human sacrifices and part of an older, unknown myth.