The opening of the first National Consultative Assembly on Mehr 14, 1285 Jalali, is regarded as a major milestone in modern Iranian history. On this day, the first session of Iran’s National Consultative Assembly was officially inaugurated with the presence of Mozaffar ad-Din Shah Qajar, political and religious figures, and elected representatives from various cities across the country. This assembly was the result of the Constitutional Revolution, which aimed to limit absolute monarchical power and establish a system based on law. The National Consultative Assembly was founded to legislate and oversee national affairs, taking its first steps toward drafting a constitution and creating new governmental structures. Around 156 representatives from different segments of society participated in this first session. The approval of the constitution and its supplement were among the assembly’s most significant achievements, paving the way for major political and social changes in Iran. The opening of the National Consultative Assembly had a profound impact on Iran’s political development, initiating a period of public participation in national decision-making. This date was officially added to the Iranian Jalali calendar after the event in 1285, to commemorate the beginning of parliamentary governance and the rule of law in the country.