Top artwork by NeverlandOddities. Don't know who created the bottom one. (If anyone knows, let me know and I'll credit them.)
In Nordic mythology, ravens are a symbol of wisdom. Odin the All Father, has a pair himself: Huginn and Muninn.
The Rose and the Raven by MistiqueStudio
The Morrigan. A popular goddess in Wicca, She extends farther back than that. She in an Irish goddess representing the various aspects of war ans sovereignty. Either as one of three sisters or as an individual goddess. [The Raven by AbigailLarson on deviantART]