The influential document drafted during the upheaval of the English Civil War was the Levellers' Agreement of the People. This manifesto articulated principles of popular sovereignty, equality, and rights, advocating for a government accountable to the people. As a radical political document of its time, it called for universal male suffrage and the abolition of feudal privileges. The Levellers played a crucial role in shaping democratic ideas, emphasizing civil liberties and political representation. While the agreement did not achieve immediate success, it influenced later democratic movements and underscored the importance of citizen participation in governance.