 The ceremony was performed by three Ghibelline cardinals who had joined Henry on his way through Italy.Robert of Naples, in the meantime, had made increasing demands upon Henry, including Henry making Robert’s son the Imperial vicar of Tuscany, and that Henry had to depart Rome within four days of his coronation.Henry, in his turn, declared that the imperial prerogative overrode papal authority, and that the entirety of Italy was subject to the emperor.