The origin of the ourchin dome dates back to Seljuqid period, seventh and eighth century. According to the available documents, Seljuqid period is considered to be the period of the efflorescence of Irans architecture in Islamic era. The architects of Seljuqid period provided the dome structures with four porches and square chambers, which are the bases of some religious and non-religious architecture. Beside the religious structures, other structures such as tombs and graves evolved and found their place among people. The architects of tomb structures of Seljuqid period passed stable days,...