Ardashir I (Middle Persian: 𐭠𐭥𐭲𐭧𐭱𐭲𐭥, romanized: Arda(x)šēr), also known as Ardashir the Unifier (180–242 AD), was the founder of the Sasanian Empire, the last empire of ancient Iran. After defeating the last Parthian shahanshah Artabanus IV on the Hormozdgan plain in 224, he overthrew the Arsacid dynasty and established the Sasanian dynasty. Afterwards, Ardashir called himself shahanshah and began conquering the land that he called Eranshahr, the realm of the Iranians.
There are various historical reports about Ardashir's lineage and ancestry. According to al-Tabari's History of the Prophets and Kings, Ardashir was son of Papak, son of Sasan. Another narrative recorded in Kar-Namag i Ardashir i Pabagan and Ferdowsi's Shahnameh states that Ardashir was born from the marriage of Sasan, a descendant of Darius III, with the daughter of Papak, a local governor in Pars.