As Sure as the Dawn: The Mark of the Lion, Book 3

Atretes, a German barbarian who has won his freedom in the Roman arena, finds his life changed forever by an encounter with a young Christian woman. Atretes vows to move heaven and earth to find his son--the baby he thought was dead, and take him back to Germany. Only one thing stands in his way: Rizpah, the Christian widow who has cared for the child since his birth.