Zoroaster (/ˌzɒroʊˈæstər/ or /ˈzɒroʊˌæstər/, from Greek Ζωροάστρης Zōroastrēs), also known as Zarathustra (/ˌzɑrəˈθuːstrə/; Avestan: 𐬰𐬀𐬭𐬀𐬚𐬎𐬱𐬙𐬭𐬀 (Zaraθuštra); Persian: زرتشت‎‎ Zartosht, زردشت Zardosht), or as Zarathushtra Spitama, was the founder of Zoroastrianism. Though he was a native speaker of Old Avestan and lived in the eastern part of the Iranian Plateau, his birthplace is uncertain.