In 1140, the Seljuq Sultan Ahmad Sanjar sent an army under Abbas, the amir of Ray, to invade Mazandaran and conquer the domains of his vassal the Bavandid ruler Ali I. Abbas captured Amol, and several minor rulers of Mazandaran submitted to him, but Ali I urged Shahrivash not to submit to the latter.
In 1142, Ali was succeeded by his son Shah Ghazi Rustam IV, but was shortly challenged by his brother Taj al-Muluk Mardavij, who was supported by Ahmad Sanjar and Shahrivash.
However, Shahrivash later changed side and supported Shah Ghazi Rustam IV.
Shah Ghazi Rustam IV shortly rewarded Shahrivash by giving him his daughter (or sister), including the two cities Natal and Paydasht.
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