The Ziyarid Dynasty was established by Mardavij Ibn-e Zyar in 928. He started from northern provinces of Mazandaran and Gorgan and continued southwards to seize Isfahan and westwards to capture Hamedan. the dynasty was ended in 1043.
One of the most important historical sites of Iran is Gonbad-e GHabus(tower of Qabus) which is the tomb of Qabus Ibn-e Voshmgir, the Ziyarid king. The tomb has a significant cylindrical architecture and it is said that the body of the king had been hanging from the ceiling in a glass coffin.
The Iranian scientist, Abu Rayhan Biruni lived during this era and was supported by the Ziyarid king, Qabus.