In 1722, Mahmud Shah Ghilzai invaded Iran and sacked the capital, Isfahan.
By 1726, Mirza Seyed Ahmad seized the provinces of Fars and Kerman.
In Kerman, the Marashi-Safavid noble, on behalf of Shah Tahmasp II, crowned himself Shah in the southern provinces on November 8, 1726.
This was the perfect time, since the Afghan Ghilzai Dynasty was having a political problem, thus leaving a vacuum to be filled up.
His execution took place on the banks of the Rud-e Zayande (Zayandeh River), near Oul-e Khwaju in August 1728.