Jerusalem Fire

To most of the galaxy he was a legend without a face, and to the rest a face without a name. And so he always had. Until Alihahd's luck ran out. And with it the stability and the very existence of the Empire which had ruled the known worlds since the onset of the human Dark Age. But on a semi-mythical planet he at last found his destiny. A planet of warrior-priests, of witches and warlocks, where men flew on wings with the eagles, and journeyed through the stars on enigmatic quests. A planet that needed only his presence to cause a jihad to boil out across the universe.

[a descrição parece muito, mas o livro não é uma imitação de Duna]