 Arrian's categorization is also very similar.Most cavalry units of the Hellenistic era were moderately armored and would be armed with javelins or/and lances.Cataphracts were introduced to the Hellenistic world by the Seleucids in the late 3rd century BC and are attested to have been used, probably in a lighter version and for a very limited time, also by the kingdom of Pergamon.