Shapur I from "Iran the Forgotten Glory" by Makan Karandish

Shapur I

Shapur was the son of Ardashir I (r. 226–240 [died 242]), the founder of the Sassanid dynasty and whom Shapur succeeded. His mother was Lady Myrōd, who—according to legend—was an Arsacid princess. The Talmud cites a nickname for her, "Ifra Hurmiz", after her bewitching beauty.

One of the great achievements of Shapur's reign was the defeat of the Roman Emperor Valerian. This is presented in a mural at Naqsh-e Rustam, where Shapur is represented on horseback wearing royal armour and crown. Before him kneels Philip the Arab, in Roman dress, asking for grace. In his right hand the king grasps the uplifted arms of what may be Valerian; one of his hands is hidden in his sleeve as the sign of submission. The same scene is repeated in other rock-face inscriptions. Shapur is said to have publicly shamed Valerian by using the Roman Emperor as a footstool when mounting his horse. Other sources contradict and note that in other stone carvings, Valerian is respected and never on his knees. This is supported by reports that Valerian and some of his army lived in relatively good conditions in the city of Bishapur and that Shapur enrolled the assistance of Roman engineers in his engineering and development plans.  (From Wikipedia)