330.)] The persons, the families, and estates of the pilgrims, were under the immediate protection of the popes; and these spiritual patrons soon claimed the prerogative of directing their operations, and enforcing, by commands and censures, the accomplishment of their vow.

Frederic the Second, [88] the grandson of Barbarossa, was successively the pupil, the enemy, and the victim of the church.

At the age of twenty-one years, and in obedience to his guardian Innocent the Third, he assumed the cross; the same promise was repeated at his royal and imperial coronations; and his marriage with the heiress of Jerusalem forever bound him to defend the kingdom of his son Conrad.

But as Frederic advanced in age and authority, he repented of the rash engagements of his youth: his liberal sense and knowledge taught him to despise the phantoms of superstition and the crowns of Asia: he no longer entertained the same reverence for the successors of Innocent: and his ambition was occupied by the restoration of the Italian monarchy from Sicily to the Alps.

But the success of this project would have reduced the popes to their primitive simplicity; and, after the delays and excuses of twelve years, they urged the emperor, with entreaties and threats, to fix the time and place of his departure for Palestine.