The Constituent Assembly of India framed the Constitution of India over a period of 2 years, 11 months and 18 days through 166 days of meetings. Key persons involved included Dr. Sachchidananda Sinha as the first president, Dr. Rajendra Prasad as the president, and Dr. Bhimrao Ambedkar as the chairman of the drafting committee. The Assembly drew upon constitutional features and principles from various nations in drafting the document.