Title: The Rider of Baikal - Bernard Clavel - book
Summary :
Emerging from the steppe in a whirlwind of snow and wind, Sadko, escorted by a few horsemen, rides toward the setting sun. Banished for having wanted to supplant the overly old chief of his clan, he flees Lake Baikal and his people, in pursuit of another dream. Over there, say the elders, moons and moons away, lies another lake, with limitless waters. Sadko and his people are approaching unknown lands called Gaul. A chief named Caesar is waging a merciless war against tribes of blond men. How will these warlike peoples welcome the "barbaric" and peaceful horde from Asia?