The area now composing Nimruz province of Afghanistan was once part of the historical region of Sistan, which over the many centuries was held by the Achaemenid Empire, Alexander the Great and others before being conquered and converted to Islam by the Muslim Arabs in the 7th century. The region became part of the Saffarid dynasty in 860 CE with its capital at Zaranj, which was one of the first local dynasties of the Islamic era. Its founder Yaqub Saffari was born and raised in this region.