hiː mˌeɪhɐv bˌɪn tˈeɪkən pɹˈɪzənɚɹ æz ɐ jˈuːθ ɪnðə kˈæptʃɚɹ ʌv ˈɪstækhɚɹ ɪn kˈɑː sˈɪkshˈʌndɹɪd fˈɪfti sˌiːˈiː, ænd lˈeɪɾɚ sˈoʊld tə ðə kˈeɪlɪf.
He may have been taken prisoner as a youth in the capture of Istakhr in ca 650 CE, and later sold to the Caliph.