"Shapur II (Middle Persian: 𐭱𐭧𐭯𐭥𐭧𐭥𐭩 Šābuhr; New Persian: شاپور, Šāpur, 309 – 379), also known as Shapur the Great, was the tenth Sasanian King of Kings ...
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(Shahanshah) of Iran. The longest-reigning monarch in Iranian history, he reigned for his entire 70-year life from 309 to 379. He was the son of Hormizd II (r. 302–309).
His reign saw the military resurgence of the country, and the expansion of its territory, which marked the start of the first Sasanian golden era. He is thus along with Shapur I, Kavad I and Khosrow I, regarded as one of the most illustrious Sasanian kings. His three direct successors, on the other hand, were less successful." - (en.wikipedia.org 11.08.2021)
