 Nyorai kuenderera mberi kweiyi ndima - Zvisinei, kufa kwaYazdegerd kwakaratidza kupera kweSasanian Empire, uye kwakaita kuti zvive nyore kuti maArabu akunde Iran yese. Khorasan yose yakakurumidza kukundwa navaArabhu, avo vaizorishandisa senzvimbo yokurwisa Transoxiana. Saka kufa kwaYazdegerd kwakaratidza kuguma kwoumambo hwokupedzisira hweIran husati hwava hwechiIslam pashure pemakore anopfuura 400 okutonga. Umambo hwakanga hwava nechizvarwa chakanga chambokunda Egipita neAsia Minor kwenguva pfupi, kunyange kusvika kure seConstantinople, hwakawira pasimba ravaArab vakashongedzerwa zvishandiso zvishomanene avo vakanga vakajaira kurwisana uye hondo dzomurenje. Vatasvi vemabhiza veSasanian vaive vanononoka uye vakarongeka kuti vavakwanise; vakashandisa maArabu akareruka kana maEast Iranian mercenaries kubva kuKhorasan neTransoxiana vangadai vakabudirira zvakanyanya. 