The Persian king Khosrau I sent troops under the command of Vahriz (), who helped the semi-legendary Sayf ibn Dhi Yazan to drive the Ethiopian Aksumites out of Yemen. Southern Arabia became a Persian dominion under a Yemenite vassal and thus came within the sphere of influence of the Sassanid Empire. After the demise of the Lakhmids, another army was sent to Yemen, making it a province of the Sassanid Empire under a Persian satrap. Following the death of Khosrau II in 628, the Persian governor in Southern Arabia, Badhan, converted to Islam and Yemen followed the new religion.