In his Methodus Medendo, Greek physician Galen describes the connection between paralysis and the severing of the spinal cord.
Publication of Galen's popular work on hygiene.
Religion
July 17 - Twelve inhabitants of Scillium in Numidia executed in Carthage (also in North Africa) for being Christians (known as the Scillitan Martyrs) -- they had refused to swear an oath to the Emperor.
Commodus creates an official cult of the Zoroastrian god Mithra.