Anastasius Bibliothecarius worked as the chief librarian and archivist
for the Bishop of Rome and was fluent in Greek. He wrote the historical work "Chronographia Tripartita" in Latin between 871 and 874 CE
Neil, 1998:42). He was more of a compiler than a writer - copying text from other authors. Textual analysis suggests that Anastasius had access
to an earlier version of Theophanes text than the copy of Theophanes that we currently have access to - perhaps what might be termed
an 'unfinished' and therefore less redacted copy.