We have to wait for the next season to find out. Funny, Rollo didn't understand what the French princess was saying (spewing venom at his barbarism) and he had a smiling 'Hello' thrown the the emperor's court, in French accent.
That seemed to be his recipe for betrayal. And if Ragnar survives, what will he do to Floki now that he has told him he knew Flovi killed his beloved priest.
