Dad-windad (also spelled Dad-bendad) was a Parthian grandee, who served as the chief secretary (dabirbad) of the last Arsacid monarch, Artabanus IV (r. 213–224).
He took part in the climactic battle of Hormozdgan in 224 between the Arsacid and Sasanian forces, which resulted in the defeat and death of Artabanus IV, with Dad-windad meeting his end shortly afterwards.
The forces of the Sasanian king Ardashir I numbered 10,000 cavalry, with some of them wearing flexible chain armor akin to that of the Romans.
[1] Artabanus IV led a greater number of soldiers, who, however, were less disposed, due to wearing the inconvenient lamellar armor.
[3] Artabanus IV was defeated and killed during the battle, which marked the end of the Parthian era and the start of 427-years of Sasanian rule.