source: In return, Rollo swore fealty to Charles, converted to Christianity, and undertook to defend the northern region of France against the incursions of other Viking groups.
target: In return, Rollo swore fealty to Charles, converted to Christianity, and began defending the northern region of France against the incursions of other Viking groups.
references: In return, Rollo swore fealty to Charles, converted to Christianity, and began defending the northern region of France against the incursions of other Viking groups. Rollo swore loyalty to Charles becoming a Christian and defended France against the Viking groups. Rollo swore to be loyal to Charles, then he changed his religion to Christianity. Rollo protected northern France by fighting Viking invaders. In return, Rollo swore loyalty to Charles and changed his religion to Christianity. He vowed to defend the northern region of France against other Viking groups. Rollo swore to Charles, converted to Christianity, and took over defending the northern region of France. Rollo promised to serve Charles, became a Christian and agreed to defend northern France against Vikings. Rollo bowed to Charles. He converted to Christianity. He defended the northern area of France from Vikings. In return, Rollo swore loyalty to Charles, converted to Christianity, and defended north France against other Viking groups. Rollo swore to be loyal to Charles, converted to Christianity and agreed to defend northern France against the entry of other Viking groups. Rollo swore loyalty to Charles and defended northern France against the Vikings.