 Sakastan was later taken by the Arab forces after a bloody fight around 650–652.Yazdegerd was also supported by the Principality of Chaghaniyan, which sent him troops to aid him against the Arabs.When Yazdegerd arrived in Marw (in what is today's Turkmenistan) he demanded tax from the "marzban" of Marw, losing also his support and making him ally with Nezak Tarkan, the Hephthalite ruler of Badghis, who helped him defeat Yazdegerd and his followers.