 Another long inscription at Estakhr mentions the King's exploits in archery in the presence of his nobles.From his titles we learn that Shapur I claimed sovereignty over the whole earth, although in reality his domain extended little farther than that of Ardashir I.
Shapur I built the great town Gundishapur near the old Achaemenid capital Susa, and increased the fertility of the district with a dam and irrigation system – built by Roman prisoners – that redirected part of the Karun River.The barrier is still called "Band-e Kaisar", "the mole of the Caesar".