What was the original name for the region where Zarmihr Karen served as Sasanian governor?
Zarmihr Karen: Zarmihr Karen (died 558) was an Iranian nobleman from the House of Karen, who served as the Sasanian governor of Zabulistan. Zabulistan: Zabulistan (Persian/Pashto: زابلستان ; "Zabul" + "-stan"), originally known as "Zavolistan", is a historical region roughly corresponding to today's Zabul Province in southern Afghanistan.
Zavolistan