Gregory I marked the way and even the Greeks acknowledged that Rome was the head of all churches.
They also received the titles of excellentissimus vir (most excellent man) and apostolic rector of Sant'Andrea, which Gregory received in 980.
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Besides the above works and a commentary against various sects of Monophysites (Severians, Theodosians, Cainites and Acephali) he left eleven discourses in defence of Pope Leo I and the Council of Chalcedon, also a work against the Agnoetae, submitted by him before publication to Pope Gregory I, who after some observations authorized it unchanged.
At the end of the ninth century John the Deacon (d. c. 882) ascribed to Gregory I the compilation of the books of music used by the schola cantorum established at Rome, by that pope.