A cataphract is an ancient heavy cavalry war horse utilized in ancient warfare. Maybe the equivalent of a modern army tank. Armenia was famous for its usage of such warhorses, in ancient times.
Strabo Geographica 11.14.9 (20 BC.): “The satrap of Armenia used to send to the Persian king twenty thousand foals every year at the time of the Mithracina. Artavasdes (king of the Armenians), at the time when he invaded Media with Antony, showed him, apart from the rest of the cavalry, six thousand horses drawn up in battle array covered with complete armour.”