During the summer of 1906, about 12,000 men camped in the gardens of the British embassy in what has been called a "vast open-air school of political science".
Demand for a parliament (majlis) began, with the goal of limiting the power of the shah.
Mozaffar ad-Din Shah agreed on a parliament in August 1906, and the first elections were held that fall.
One hundred fifty-six members were elected, the overwhelming majority from Tehran and the merchant class.

The National Consultative Assembly first met in October 1906.
The shah was old and frail, and attending the inauguration of parliament was one of his last official acts.
Mozaffar ad-Din Shah's son, Muhammad Ali, was unsympathetic to constitutionalism; the shah signed the constitution (modeled on the Belgian constitution) by December 31, 1906, making his power contingent on the will of the people, and died three days later.
During the summer of 1906, about 12,000 men camped in the gardens of the British embassy in what has been called a "vast open-air school of political science". Demand for a parliament (majlis) began, with the goal of limiting the power of the shah. Mozaffar ad-Din Shah agreed on a parliament in August 1906, and the first elections were held that fall. One hundred fifty-six members were elected, the overwhelming majority from Tehran and the merchant class.
The National Consultative Assembly first met in October 1906. The shah was old and frail, and attending the inauguration of parliament was one of his last official acts. Mozaffar ad-Din Shah's son, Muhammad Ali, was unsympathetic to constitutionalism; the shah signed the constitution (modeled on the Belgian constitution) by December 31, 1906, making his power contingent on the will of the people, and died three days later.
Persian Constitutional Revolution