Considerable mystery still exists about the identity of Honorius, both Pope Honorius I and Pope Honorius III have been linked to the character.
Edward Gibbon claims that Pope Honorius I reconciled the Patriarch to Rome in 638, although this did not last.
Soon after his enthronement he forwarded his noted synodical letter to Pope Honorius I and to the Eastern patriarchs, explaining the orthodox belief in the two natures, human and divine, of Christ, as opposed to Monothelitism, which he viewed as a subtle form of heretical Monophysitism (which posited a single divine nature for Christ).
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He also compiled a historical work, "Chronographia tripartita", from the Greek writings of Theophanes, Nicephorus, and George Syncellus, and made a collection of documents concerning the affairs of Pope Honorius I.
These excavations permitted to ascertain that the martyr Valentine was not buried into the catacomb, but directly into a pit outside it; on this subdial grave Pope Jiulius I (336–352) built a former basilical structure, which was modified and enlarged by popes Honorius I (625–638) and Theodore I (642–649) and further restored in the following centuries until the last works carried out by Pope Nicholas II in mid-11th century.