Vikings: Overlords of the Icy Seas

The fjord lay calm, its surface like polished glass, reflecting the leaden clouds hanging in the sky. Flocks of ravens circled back and forth, heralding the bitter northern winds soon to sweep southward. This was the very first scene the protagonist beheld after traveling through time to ninth-century Scandinavia. He had become nothing more than an ordinary self-sufficient farmer, with only a barren, desolate wheat field to his name. For centuries, the glory of the Roman Empire had crumbled into dust. The world lay shattered, kings waged endless wars against one another, and in this turbulent, dark Middle Ages, his first task was simply to survive—then, somehow, to find a way to end the chaos… — Description from novelcodex.org