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Sun Yat-sen and Chiang Kai-shek looking out a window, circa 1890s. (Photo by Fotosearch/Getty Images).

Sun Yat-sen and Chiang Kai-shek looking out a window, circa 1890s. (Photo by Fotosearch/Getty Images).

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circa 1912: Dr Sun Yat Sen (1866 - 1925), President of the Southern Government of China, seen when he was a Chinese revolutionary leader. (Photo by Hulton Archive/Getty Images)

circa 1912:  Dr Sun Yat Sen (1866 -  1925), President of the Southern Government of China, seen when he was a Chinese revolutionary leader.  (Photo by Hulton Archive/Getty Images)

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CHINE - 1917: Portrait de Sun Yat-sen, Généralissime dans le gouvernement en Chine en 1917. (Photo by Keystone-France\Gamma-Rapho via Getty Images)

CHINE - 1917: Portrait de Sun Yat-sen, Généralissime dans le gouvernement en Chine en 1917.  (Photo by Keystone-France\Gamma-Rapho via Getty Images)

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CHINA - JANUARY 01: A portrait around 1921 of the President of the Chinese Republic, SUN YAT-SEN. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

CHINA - JANUARY 01:  A portrait around 1921 of the President of the Chinese Republic, SUN YAT-SEN.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)

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1st July 1923: Sun Yat-Sen (1867 - 1925), aka Sun Wen or Sun Zhong Shan, the Chinese revolutionary born near Canton, who became provisional President of China in 1912 after it was declared a republic. Soon he was back in exile and only became full President in 1923. (Photo by Topical Press Agency/Getty Images)

1st July 1923:  Sun Yat-Sen (1867 - 1925), aka Sun Wen or Sun Zhong Shan, the Chinese revolutionary born near Canton, who became provisional President of China in 1912 after it was declared a republic. Soon he was back in exile and only became full President in 1923.  (Photo by Topical Press Agency/Getty Images)