Since ancient times, Ravens have played a key role in mythology and superstition. People believed they were the souls of wicked priests, while crows were evil nuns.
Ravens were believed b to be an omen of battle and bloodshed. The Irish believed that the war goddess would call ravens down from the sky to eat the corpses of the fallen. And this is what ravens do, goddess or no goddess.
In India, they see ravens as the souls of the deceased which represent bad or good luck, and in Germany, ravens are believed to hold the souls of the damned.