Hormizd-Ardashir, better known by his dynastic name of Hormizd I (also spelled Hormozd I or Ohrmazd I; Middle Persian: 𐭠𐭥𐭧𐭥𐭬𐭦𐭣), was the third Sasanian King of Kings (shahanshah) of Iran, who ruled from May 270 to June 271. He was the third-born son of Shapur I (r. 240–270), under whom he was governor-king of Armenia, and also took part in his father's wars against the Roman Empire. Hormizd I's brief time as ruler of Iran was largely uneventful. He built the city of Hormizd-Ardashir (present-day Ahvaz), which remains a major city today in Iran. He promoted the Zoroastrian priest Kartir to the rank of chief priest (mowbed) and gave the Manichaean prophet Mani permission to continue his preaching.
|King of Kings of Iran and non-Iran|
|King of Armenia|
|Reign||c. 252 – 270|
|Predecessor||Tiridates II (Arsacid dynasty)|
|Shahanshah of the Sasanian Empire|
|Reign||May 270 – June 271|
|House||House of Sasan|
|Mother||unnamed daughter of Mihrak|
It was under Hormizd I that the title of "King of Kings of Iran and non-Iran" became regularized in Sasanian coinage; previously, the royal titulary had generally been "King of Kings of Iran." Hormizd I was succeeded by his eldest brother Bahram I.