Kay Khosrow is a legendary king of Iran of Kayanian dynasty and a character in the Persian epic book, Shahnameh. He was the son of the Iranian prince Siavash who married princess Farangis of Turan while in exile. Before Kay Khosrow was born, his father was murdered in Turan by his maternal grandfather Afrasiab. Kay Khosrow was trained as a child in the desert by Piran, the wise vizier of Afrasiab. His paternal grandfather was Kay Kāvus, the legendary Shah of Iran who chose him as his heir when he returned to Iran with his mother. The name Kay Khosrow derives from Avestan 𐬐𐬀𐬎𐬎𐬌 𐬵𐬀𐬊𐬯𐬭𐬀𐬎𐬎𐬀𐬢𐬵𐬀 Kauui Haosrauuaŋha, meaning "seer/poet who has good fame".