CERAMICS . xiv. The Islamic Period, 11th-15th centuries. Saljuq and post-Saljuq periods (429-654/1038-1256) Earthenware.There is very little firm evidence for either localization or precise dating of pottery made in Persia in the 5th/11th and early 6th/12th centuries, as few controlled excavations have been undertaken and very few dated ...