Conan The Usurper by Robert E. Howard

Now ruling as a rough-hewn monarch, the Cimmerian faces courtly treachery, rebellious nobles, and sinister sorcerers who conspire to strip him of power; the stories follow his brutal clashes, narrow escapes, and daring campaigns of revenge and recovery as he uses violence, cunning, and raw leadership to defend and reclaim his throne in a grim, sword-and-sorcery age.