The revolutionary figure primarily associated with the phrase "No taxation without representation" is James Otis. This slogan encapsulated the colonial discontent with British taxation policies imposed without any elected representatives from the American colonies. Otis's impassioned arguments against the legitimacy of such taxation became influential in galvanizing colonial opposition to British rule. His ideas were later echoed by other leaders, including Samuel Adams and Patrick Henry, as they rallied support for the American Revolution. The phrase ultimately became a rallying cry for American independence, emphasizing the essential right of representation in governance.