Events from 180

St. Irenaeus writes Against Heresies - student of Polycarp, defends apostolic succession against Gnosticism

Death of Marcus Aurelius - dies of plague at Vindobona, end of Pax Romana

Commodus becomes sole emperor - abandons father's wars, becomes gladiator-emperor

St. Cecilia martyred - Roman noblewoman, patron of music, survived suffocation attempt, beheaded after three strikes

Muratorian Canon compiled - earliest known list of New Testament books, includes 22 of 27 books

Irenaeus writes Against Heresies - Student of Polycarp combats Marcionites and Gnostics, establishes OT-NT unity

Irenaeus writes Against Heresies - Five books exposing and refuting Gnostic sects, especially Valentinians, first systematic heresiology

Marcus Aurelius debases coinage - silver mines exhausted, reduces silver content of denarius to 75%, inflation begins

Galen systematizes wine medicine - classifies wines by medical properties, prescribes specific wines for specific conditions