 However, sometime in 629, the "Nimruzi" withdrew their support for the shah, and started to conspire with the distinguished Iranian general Shahrbaraz to overthrow him.The "Pahlav", under their leader Farrukh Hormizd of the Ispahbudhan clan, responded by supporting Ardashir's aunt Boran as the new ruler of Iran, who subsequently started minting coins in the "Pahlav" areas of Amol, Nishapur, Gurgan and Ray.One year later, Shahrbaraz with a force of 6,000 men marched towards Ctesiphon and besieged the city.