Pu Ru was a traditional Chinese painter and calligrapher and cousin of Pu Yi, the last Emperor of China. He was born as Pu Xinyu on August 30, 1896, in Beijing, China, as a member of the Manchu royal family (Pu Ru). Puru was once selected as a potential candidate to succeed the Guangxu Emperor, but his cousin Puyi was the chosen one. Pu Ru went on to study astronomy and biology at the University of Berlin(Biography of Pu Ru). After returning to China in 1922 he spent many years in the mountains at the Jie Tai Monastery perfecting his calligraphy and painting techniques. He began to collaborate with the well-known Beijing painter Zhang Daqian, and together they became known as the “South Zhang and North Pu”(Biography of Pu Ru). Following the overthrow of the Qing dynasty, he fled to Taiwan, where he made a living selling his work. In 1949, he was appointed a professor at National Taiwan Normal University. Pu Ru was praised for his all-around talents in the Chinese tradition and, in spite of his Western education, advocated for traditional Chinese painting. In 1959, he held a comprehensive exhibition of his works at the National Museum of History in Taipei. The artist died in Taiwan on November 18, 1963.

References:

http://www.art-virtue.com/painting/history/ching/PuRu/bio-PuRu.htm#1
“Ru Ru”, Pu Xinyu shu hua ji
Biography of Pu Ru, http://www.chinaonlinemuseum.com/painting-pu-xinyu.php