(810-879) Librarian of the Vatican, sometimes identified with the antipope. The latter was a Roman presbyter, later cardinal-priest, excommunicated by Pope Leo IV, 850. Upon Leo's death, 855, he was elected pope by the imperial party, but the rightfully elected Benedict III gained the supremacy. His successor, Nicholas I, appointed as librarian, 867, an Anastasius who had been Abbot of Sancta Maria Trans-Tiberim, Rome, 858-867, and, if the same as the antipope, he must have been pardoned by Nicholas. Anastasius the librarian was appointed legate to Constantinople, 869, where he assisted at the Eighth AEcumenical Council and translated its "Acts" into Latin. He was confirmed in his office by Pope John VIII, 872.
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