Yemen was conquered in 570 by a small expeditionary aswaran force led by the Sasanian veteran Vahrez−the Himyarite prince Sayf ibn Dhi-Yazan was then appointed as a vassal king of the Sasanians in the country, whilst Vahrez went back to the Sasanian capital of Ctesiphon. One of the main reasons behind the Sasanian conquest was due to their interest in dominating the trade route from Constantinople to India and the Far East, which was now possible with their authority established in Yemen.[1]