 Complete the following phrase:  While no date has been established for the origin of the Soran Emirate, Kurdish historian Sharaf al-Din Bitlisi mentions the Emirate in Sharafnama in 1597 as established by a shepherd by the name of Isa. Bitlisi claims that villagers quickly followed the popular Isa and they attacked the Rewan Castle where they established themselves. They took the name Soran meaning from red after the red stones near the castle. Year later, during the 