Other constituent parts of the Lateran complex are the building of the Scala Sancta with the Sancta Sanctorum and the Triclinium of Pope Leo III.
With Pope Leo III's coronation of Charlemagne, first of the Carolingian emperors, the papacy also gained his protection.
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Nevertheless, according to the forensic testimony of his successor, Ingoald, the monastery lost property during the reign of Pope Leo III (795–816), partly from the unlawful seizures of the Holy See.
Perhaps the only example of its literal translation found in Greek authors is in the second letter of Theodore the Studite to pope Leo III, kyrio apostoliko.
In a court run by a bishop and a representative of the emperor, and in the presence of Gregory, Ingoald, the Abbot of Farfa, claimed that the Frankish emperors had granted them the lands, and that Popes Adrian I and Leo III had taken possession of the land illegally.