Sun Yat-sen (pinyin: Sūn Yìxiān; 12 November 1866 – 12 March 1925) was a Chinese revolutionary and political leader. As the foremost pioneer of Nationalist China, Sun is frequently referred to as the Founding Father of Republican China, a view agreed upon by both Mainland China and Taiwan. Sun played an instrumental role in inspiring the overthrow of the Qing Dynasty, the last imperial dynasty of China. Sun was the first provisional president when the Republic of China (ROC) was founded in 1912 and later co-founded the Chinese National People's Party or Kuomintang (KMT) where he served as its first leader. Sun was a uniting figure in post-Imperial China, and remains unique among 20th-century Chinese politicians for being widely revered amongst the people from both sides of the Taiwan Strait. Although Sun is considered one of the greatest leaders of modern China, his political life was one of constant struggle and frequent exile. After the success of the revolution, he quickly fell out of power in the newly founded Republic of China, and led successive revolutionary governments as a challenge to the warlords who controlled much of the nation. Sun did not live to see his party consolidate its power over the country. His party, which formed a fragile alliance with the Communists, split into two factions after his death. Sun's chief legacy resides in his developing a political philosophy known as the Three Principles of the People: nationalism, democracy, and the people's livelihood.