In late Egyptian mythology, Mer-Wer (also spelled Mnevis) was an aspect of the chief god in the region of Heliopolis, Atum-Ra. The origin and meaning of its name is currently unknown. Mnevis was identified as being a living bull. This may be a vestige of the sacrifice of kings after a period of reign, who were seen as the sons of Bat or Hathor, the ancient cow deity of the early solar cults. Thus, seen as a symbol of the later sun god, Ra, the Mnevis was often depicted, in art, with the solar disc of their mother, Hathor between its horns.