Emperor Gaozong of Tang
According to the "Old Book of Tang", Peroz asked for military help from Tang China against the Arabs in 661. The Tang court created the Area Command of Persia (波斯都督府) at what is now Zaranj/Zābol (疾陵城 "Jilicheng") (on the modern border of Afghanistan and Iran), with Peroz as commander-in-chief (都督 "Dudu") Between 670 and 674, Peroz arrived personally at the Tang court and was given the title of "Yòuwǔwèi Jīangjūn" (右武衛將軍, "Martial General of the Right [Flank] Guards"). The imperial court allowed Sassanian refugees fleeing from the Arab conquest to settle in China. The Emperor of China at this time was Emperor Gaozong of Tang.