The Tyrant (General Raj Whitehall‪)‬

On the planet Hafardine, civilization must rediscover progress or collapse. Adrian, guided by disembodied electronic mentors from space, has brought
gunpowder and steam power to the Kingdom of the Isles to break the stranglehold of the Empire. But he will have to avoid being killed by the suspicious
king he serves, by the barbarians he must recruit, and even by his insanely vengeful brother.