At this point, Ardashir moved his capital further to the south of Persis and founded a capital at Ardashir-Khwarrah (formerly Gur, modern day Firouzabad).[5] After establishing his rule over Persis, Ardashir I rapidly extended the territory of his Sassanid Persian Empire, demanding fealty from the local princes of Fars, and gaining control over the neighboring provinces of Kerman, Isfahan, Susiana, and Mesene.