The revolution led to Causation the establishment of a parliament in Persia ( Iran ) during the Qajar dynasty .

The old order , which King Nassereddin Shah Qajar had struggled for so long to sustain , finally died Death , to be replaced by new institutions , new forms of expression , and a new social and political order .

The monarch Mozaffar ad-Din Shah Qajar signed Writing the constitution in 1906 , but he died Death shortly after and was replaced by Mohammad Ali Shah .

The constitutionalist forces marched Motion_directional to Tehran , forced Request Muhammad Ali Shah 's abdication in favor of his young son Ahmad Shah Qajar and then re-established Creating the constitution in 1909 .

On December 12 , 1925 , Iran 's parliament amended Change_event_time Iran 's constitution of 1906–1907 to replace the Qajar dynasty ( 1797–1925 ) with the Pahlavi dynasty as the legitimate sovereigns of Iran .