 It bore a good deal of the military action, and, as Cremona regularly rejected its demands in litigation for redress and reparations, Crema developed a grudge.This was particularly wrenching since Crema was politically subject to Cremona and spiritually subject to its bishop.To gain an advantage, the leaders of Cremona urged the Emperor Frederic Barbarossa to destroy Crema in exchange for a considerable sum of money, which would allow him to pursue his ventures in the Po Valley.