Inscriptional Pahlavi is the earliest attested form of Pahlavi scripts, and is evident in clay fragments that have been dated to the reign of Mithridates I. Other early evidence includes the Pahlavi inscriptions of Parthian coins and rock inscriptions of Sasanian emperors and other notables, such as Kartir the High Priest.
Inscribed stone block from the Paikuli inscription
Inscriptional Pahlavi text from Shapur III at Taq-e Bostan, 4th century
Kartir's inscription at Naqsh-e Rajab
Sasanian relief with Inscriptional Pahlavi monogram ʾpr, which stands for abzūn farr, meaning "May his farr increase!"
Shapur III, was the Sasanian King of Kings of Iran from 383 to 388. He was the son of Shapur II and succeeded his uncle Ardashir II.
A depiction of a king killing a leopard on the "Klimova Plate" (Hermitage Museum), presumed to be Shapur III
Gold dinar of Shapur III, Sindh mint
Relief of Shapur III (left) and Shapur II (right).
19th-century drawing of the relief from a book of George Rawlinson.