Sun Yat-sen was a Chinese revolutionary and political leader, often called the "Father of Modern China." He played a crucial role in overthrowing the Qing Dynasty, which had ruled China for centuries. Sun believed in the need for a republic and worked tirelessly to promote ideas of democracy and nationalism. His vision laid the groundwork for the establishment of the Republic of China in 1912. Sun Yat-sen's political philosophy, known as the "Three Principles of the People," emphasized nationalism, democracy, and people's livelihood. He inspired many future leaders, including Chiang Kai-shek, and his legacy continues to influence Chinese politics today. Sun's dedication to his country and its people makes him a significant figure in Chinese history.