Libellus de imperatoria potestate in urbe Roma is an anonymous Latin treatise on the authority of the Holy Roman Emperor in the city of Rome. It has been dated to between the late 9th century and the middle of the 10th. It was probably written at Spoleto. It survives in one manuscript, which was appended to the contemporary "Chronicon" of Benedict of Sant'Andrea.
The "Libellus" argues for the authority of the Holy Roman Emperor in the so-called "patrimony of Saint Peter". The author clearly sides with the Emperor Louis II against Pope Nicholas I. 
Ferdinand Gregorovius calls its author an "Imperialist" and a "partisan", and doubts the accuracy of his claim that "[the emperor's] legate resides in Rome at all times". According to Eleanor Duckett, the author of the "Libellus" "poured out his feelings into that interesting document".
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