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In page Shapur II:

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"Shapur" was a popular name in Sasanian Iran, being used by three Sasanian monarchs and several notables of the Sasanian era and its later periods. The name is derived from Old Iranian *xšayaθiya.puθra ("son of a king") and initially must have been a title, which became−at least in the late 2nd century AD, a personal name.[1] The name appears in the list of Arsacid kings in some Arabic-Persian sources, however, this is anachronistic.[1] The name of Shapur is known in other languages as; Greek Sapur, Sabour and Sapuris; Latin Sapores and Sapor; Arabic Sābur and Šābur; New Persian Šāpur, Šāhpur, Šahfur.[1]