 At that point, Emperor Henry was the most powerful monarch in the Mediterranean and Europe, since the Sicilian kingdom added to his personal and Imperial revenues an income without parallel in Europe.However, his aims to integrate Sicily into the Empire as a second power base of the Hohenstaufen dynasty were not realised during his lifetime.The negotiations with Pope Celestine III to approve the unification ("unio regni ad imperium") in return of another crusade reached a deadlock.