590 AD - Pope Gregory I has only one goal in mind: the conversion of the last remaining pagan communities and going down in history as the Pontiff capable of unifying the empire under Christendom. With the military support of the augustus Maurice, a war campaign is therefore launched to subdue and evangelize the closest pagan kingdom to Italy, that Sardinian hinterland known as Barbaria. This, however, is ruled by the dux Hospiton, a warrior committed for decades to protecting his compatriots, their roots but above all a very ancient cult, that of the Sardus Pater. To get the better of the imperial militia commanded by Zabarda, Hospiton will have to use every resource at his disposal. And when all will seem lost, he will discover he can rely on an even greater power, of which he had never been aware. A power that had watched over the people of Sardinia since the dawn of time.