Yazdegerd, although being acknowledged as the rightful monarch by both the Parsig and Pahlav factions, did not seem to have held sway over all of his empire. Indeed, during the first years of his rule coins were only minted in Pars, Sakastan, and Khuzestan, approximately corresponding to the regions of the southwest (Xwarwarān) and southeast (Nēmrōz), where the Parsig was based.[22] The Pahlav, who were mainly based in the northern portion of the empire, refused to mint coins of him.[22] The empire was also at the same time invaded on all fronts; by the Turks in the east, and by Khazars in the west, who raided Armenia and Adurbadagan.[23] The Sasanian army had been heavily weakened due to the war with the Byzantines and internal conflict.[24] The circumstances were so chaotic, and the condition of the nation so alarming, that "the Persians openly spoke of the immanent downfall of their empire, and saw its portents in natural calamities."[2] The empire met its end against the Arabs during the Arab invasion of Iran, with Yazdegerd being killed in 651, possibly at the instigation of one his own subjects.