ens ▁in ▁good ▁condition ▁which ▁also ▁limits ▁the ▁interest ▁in ▁the ▁study ▁of ▁cer am ics ▁of ▁these ▁periods . ▁ ▁Arch ae ological ▁exc av ations ▁carried ▁out ▁in ▁Jordan ▁un cover ed ▁only ▁a ▁few ▁examples ▁from ▁the ▁Um ay y ad ▁period , ▁mostly ▁ung laz ed ▁vessels ▁from ▁Kh ir bat ▁Al - M af jar . ▁ ▁In ▁the ▁East , ▁evidence ▁shows ▁that ▁a ▁production ▁centre ▁was ▁set ▁up ▁in ▁Sam ark and ▁under ▁the ▁Sam an id ▁dynast y ▁who ▁ruled ▁this ▁region ▁and ▁parts ▁of ▁Pers ia ▁between ▁ 8 7 4 ▁and ▁ 9 9 9 ▁A . D . ▁ ▁The ▁most ▁highly ▁regarded ▁technique ▁of ▁this ▁centre ▁is ▁the ▁use ▁of ▁call ig raph y ▁in ▁the ▁decor ation ▁of ▁vessels . ▁ ▁East ▁Pers ian ▁pot tery ▁from ▁the ▁ 9 th ▁to ▁ 1 1 th ▁centuries ▁decor ated ▁only ▁with ▁highly ▁st yl ised ▁ins cri ptions , ▁called ▁" ep ig raph ic ▁w are ", ▁has ▁been ▁described ▁as ▁" pro bably ▁the ▁most ▁ref ined ▁and ▁sensitive ▁of ▁all ▁Pers ian ▁pot tery ". ▁ ▁Chinese ▁influence ▁ ▁During ▁the ▁Abb as id ▁dynast y ▁pot tery ▁production ▁gained ▁momentum , ▁largely ▁using ▁tin ▁gla zes ▁mostly ▁in ▁the ▁form ▁of ▁op aque ▁white ▁gla ze . ▁ ▁Some ▁histor ians , ▁such ▁as ▁Arthur ▁Lane , ▁attribute ▁the ▁rise ▁of ▁such ▁industry ▁to ▁Chinese ▁influence . ▁Ev idence ▁from ▁Muslim ▁manuscript s , ▁such ▁as