The Radical Phase in Revolution refers to a period during the French Revolution, specifically from 1792 to 1794, characterized by extreme political and social upheaval. This phase saw the rise of radical groups, such as the Jacobins, who sought to eliminate all vestiges of the old regime and establish a republic based on principles of equality and popular sovereignty. The execution of King Louis XVI and the establishment of the Reign of Terror exemplified the intense revolutionary fervor and the use of violence to achieve political objectives during this tumultuous time.