libellus de imperatoria potestate in urbe roma造句

It was unclear whether the Papal States were a separate realm with the pope as their sovereign ruler, merely a part of the Frankish Empire over which the popes had administrative control, as suggested in the late 9th century treatise " Libellus de imperatoria potestate in urbe Roma ", or whether the Holy Roman Emperors were vicars of the pope ( as a sort of Archemperor ) ruling Christendom, with the pope directly responsible only for the environs of Rome and spiritual duties.
It's difficult to find libellus de imperatoria potestate in urbe roma in a sentence. 用libellus de imperatoria potestate in urbe roma造句挺难的