context: Dara I, Darius I (Greek: Δαρεῖος) (in Persian: Darius km) as the Persians call him Darius the Great is the third Achaemenid king ruled from 521 BC to 486 BC The son-in-law of Smerds, the son of Wehtashab, and the grandson Arsames.
question: Who is Darius I?
answers.text: the third Achaemenid king