Sabbathius Osbourne (—6 ABY) was a Dark Jedi several years after the death of Emperor Palpatine. It is likely that Osbourne was one of Palpatine's Dark Side Adepts, and was trained by the Emperor himself. It's also likely he received further training by Wyth Skellheim, an earlier Dark Jedi. Whenever Osbourne began his training, he began his Imperial career as an Imperial Navy officer, working his way up to the rank of Admiral before retiring to pursue his interests in the Dark Side of the Force. From SW1ki, a Wikia wiki.