1. To seize by force; plunder
2. To eat or prowl voraciously
3. To have a ravenous appetite
This word is first attested in 1513 and has nothing to do with this guy:
As for the black, winged raven, it comes from Old English hræfn from Proto-Germanic *khrabanas, which derives from Proto-Indo-European *qer-, which is imitative of harsh sounds.