After winning the Battle of Chartres, King Charles the Simple struck a bargain with Rollo the Viking. What did Rollo promise to do for Charles?
ROLLO PROMISED TO PAY HIM TRIBUTE FOR 20 YEARS
ROLLO PROMISED HIM ENDLESS SUPPLY OF CREAM PUFFS
ROLLO PROMISED TO MARRY HIS DAUGHTER
HE PROMISED TO BECOME A CHRISTIAN & SWEAR LOYALTY TO CHARLES