The Sasanian Rock Reliefs belong to the most beautiful monuments I have ever seen in Iran. Unlike Achaemenid court art, which is dignified and static, Sasanian art is dynamic and almost expressionist. And where the Achaemenids wanted to express that their monarchy was eternal and therefore refrained from individualism, the Sasanian sculptors show us particular kings and noblemen, who can be identified from their crowns and badges.
The reliefs can be found on several places in Iran: for example, in Bishapur, Sarab-i Bahram, Taq-e Bostan, Barm-e Dilak, Naqš-e Rajab, Guyum, Firuzabad, and especially Naqš-i Rustam. The standard book on the subject is Louis Vanden Berghe’s Reliefs rupestres de l’ Iran ancien (1983 Brussels).