Mard o mard

Mard ō mard was an ancient Iranian tradition of single combat, the Sasanian Empire being most known for using it. During a battle, the Sasanian troops would use taunts and war cries to provoke the enemy into a single duel with a Sasanian champion. The tradition meant much to the Sasanians—in 421, during Bahram V's war against the Romans in 421–422, Ardazanes, a member of the "Immortals", was in a single duel killed by the Roman comes Areobindus.
In Sasanian art several mard o mard depictions are preserved in rock-reliefs in Naqsh-e Rostam and in a cameo of Shapur I and Valerian.
Single combats have been narrated in Shahnameh of Ferdowsi, a notable example being those of the story of Davazdah Rokh.