Ares (mythology)

Ares was the Greek god of warfare, specifically the more barbaric parts such as slaughter and bloodlust - his sister (and fellow war-deity) was known as Athena and embodied the more honorable parts of warfare.

The ancient Greeks had a love-hate relationship with Ares as they knew he was important yet were also fully aware of the more negative aspects of the deity, like almost all deities Ares is more accurately described as amoral rather than evil as he had both positive and negative traits (much like the concepts he embodied).