Question: Who was  the last emperor or last "Son of Heaven" of China?

full_context: Document 1: Ruzi Ying: Ruzi Ying (; 5 CE – 25 CE), also known as Emperor Ruzi of Han and the personal name of Liu Ying (劉嬰), was the last emperor of the Chinese Western Han Dynasty from 6 CE to 9 CE. After Emperor Ai of Han and Emperor Ping died without heirs, Wang Mang chose the youngest of the available successors in order to maintain his power in the government. The child Ying was soon deposed by Wang Mang who declared the Xin Dynasty in place of the Han. During Xin Dynasty, Ying was under effective house arrest—so much so that as an adult, he did not even know the names of common animals. Before and after the Xin Dynasty was overthrown in 23 CE, many ambitious people claimed to be restoring the Han dynasty. In 25 CE, a rebellion against the temporary Emperor Gengshi used the former Emperor Ruzi as a focus, and when the rebellion was defeated, he was killed. He is often viewed as an innocent child who was the victim of tragic circumstances. (The expression "Emperor Ruzi" is a misnomer, as he never assumed the throne and was only named crown prince. Nevertheless, he is commonly referred to as such.)
Document 2: Qin Shi Huang: Qin Shi Huang ( ; 18 February 25910 September 210) was the founder of the Qin dynasty (秦朝 ) and was the first emperor of a unified China. He was born Ying Zheng (嬴政 ) or Zhao Zheng (趙政 ), a prince of the state of Qin. He became the King Zheng of Qin (秦王政 ) when he was thirteen, then China's first emperor when he was 38 after the Qin had conquered all of the other Warring States and unified all of China in 221 BC. Rather than maintain the title of "king" borne by the previous Shang and Zhou rulers, he ruled as the First Emperor (始皇帝 ) of the Qin dynasty from 220 to 210 BC. His self-invented title "emperor" (皇帝 , "  "), as indicated by his use of the word "First", would continue to be borne by Chinese rulers for the next two millennia.
Document 3: Manchukuo: Manchukuo (: "Mǎnzhōuguó"literally: " State of Manchuria" ) was a puppet state in Northeast China and Inner Mongolia, which was governed under a form of constitutional monarchy. The area, collectively known as Manchuria by westerners and Japanese, was designated by China's erstwhile Qing Dynasty as the "homeland" of the ruling family's ethnic group, the Manchus. In 1931, the region was seized by Japan following the Mukden Incident and a pro-Japanese government was installed one year later with Puyi, the last Qing emperor, as the nominal regent and emperor. Manchukuo's government was abolished in 1945 after the defeat of Imperial Japan at the end of World War II. The territories formally claimed by the puppet state were first seized in the Soviet invasion of Manchuria in August 1945, and then formally transferred to Chinese administration in the following year.
Document 4: Qin dynasty: The Qin dynasty () was the first dynasty of Imperial China, lasting from 221 to 206 BC. Named for its heartland of Qin, in modern-day Gansu and Shaanxi, the dynasty was founded by the Qin state and its founding emperor took the title Qin Shi Huang, the First Emperor of Qin. The strength of the Qin state was greatly increased by the "Legalist" reforms of Shang Yang in the fourth century BC, during the Warring States period. In the mid and late third century BC, the Qin state carried out a series of swift conquests, first ending the powerless Zhou dynasty, and eventually conquering the other six of the Seven Warring States. It is the shortest major dynasty in Chinese history, lasting only 15 years with two emperors, but the imperial system it inaugurated lasted, with interruptions and adaptation, until 1911.
Document 5: The Last Emperor: The Last Emperor (Italian: "L'ultimo imperatore" ) is a 1987 British-Italian epic biographical film about the life of Puyi, the last Emperor of China, whose autobiography was the basis for the screenplay written by Mark Peploe and Bernardo Bertolucci. Independently produced by Jeremy Thomas, it was directed by Bertolucci and released in 1987 by Columbia Pictures. Puyi's life is depicted from his ascent to the throne as a small boy to his imprisonment and political rehabilitation by the Communist Party of China.
Document 6: Jin Youzhi: Jin Youzhi (17 August 1918 – 10 April 2015), born Aisin-Gioro Puren, was the nominal head of the Aisin-Gioro clan, the imperial clan of the Manchu-led Qing dynasty, from 1994 until his death in 2015. He was the fourth and youngest son of Prince Chun, and a younger half-brother of Puyi, the Last Emperor of China. Instead of using his Manchu clan name "Aisin-Gioro" as his family name, Puren adopted "Jin" as his new family name. "Jin" means "gold" in Mandarin, as does "Aisin" in the Manchu language. His courtesy name was "Youzhi"; he is best known as "Jin Youzhi". The Chinese media referred to him as "The Last Emperor's Younger Brother" or "The Last Imperial Younger Brother (最后的皇弟).
Document 7: Jia Yinghua: Jia Yinghua () was a Chinese writer and researcher who focused on the late Qing Dynasty. He served as Vice President of the Biography Society of China, commissioner of National Commission of the Chinese Writers’ Association, President of China's Electrical Power Writers' Association. Representative works of his include "The Later Half of the Last Emperor's Life" (), "The Last Eunuch of China: The Life of Sun Yaoting]]" (), "The Last Emperor’s Brother: The Life of Pujie" (). The Japanese version of The Later Half of the Last Emperor's Life is a bestseller in Japan, attracting great attention and garnering enormous popularity. According to authoritative media and press organizations in more than 100 countries and regions, including China, the United Kingdom, the United States, France, Japan, Hong Kong, Macao, and Taiwan this book is a successful continuation of "From Emperor to Citizen" (): The Autobiography of Aisin-Gioro Pu Yi () written by Pu Yi himself. The Chinese version of "The Later Half of the Last Emperor’s Life" is always a domestic bestseller and has been published nine times in total, and also won the Gold Key Award in the 5th Chinese Books Fair. His calligraphic works were also incorporated into "First Exhibition of Chinese Celebrities’ Calligraphic Works", "Exhibition of Contemporary Celebrities’ Paintings and Calligraphies", etc.
Document 8: Emperor of China: The Emperor of China () was the sovereign of Imperial China reigning between the founding of the Qin dynasty that unified China in 221 BC, until the abdication of Puyi in 1912 following the Xinhai Revolution and the establishment of the Republic of China. The emperor was also referred to as the "Son of Heaven" (), a title that predates the Qin unification and recognized as the ruler of "all under heaven" (i.e., the whole world). In practice not every Emperor held supreme power in China, although this was usually the case.
Document 9: Warring States period: The Warring States period () was an era in ancient Chinese history following the Spring and Autumn period and concluding with the Qin wars of conquest that saw the annexation of all other contender states, which ultimately led to the Qin state's victory in 221 BC as the first unified Chinese empire known as the Qin dynasty. Although different scholars point toward different dates ranging from 481 BC to 403 BC as the true beginning of the Warring States, Sima Qian's choice of 475 BC is the most often cited. The Warring States era also overlaps with the second half of the Eastern Zhou dynasty, though the Chinese sovereign, known as the king of Zhou, ruled merely as a figurehead and served as a backdrop against the machinations of the warring states.
Document 10: Qin Shi Huang (2001 TV series): Qin Shi Huang is a Chinese television series based on the life of Qin Shi Huang, the First Emperor who unified China under the Qin dynasty in 221 BC. The series was filmed between 1999 and 2000 and was first released in 2001 in Hong Kong and Thailand and in 2002 in Singapore. In China, the series was edited and altered by historians and experts before it was approved for broadcast on CCTV-1 in 2007.
Document 11: Emperor Bing of Song: Zhao Bing (12 February 1272 – 19 March 1279), also known as Emperor Bing of Song, was the 18th and last emperor of the Song dynasty in China. He was also the ninth and last emperor of the Southern Song dynasty. He reigned for about 313 days from 1278 to 1279 until his death.
Document 12: Puyi: Puyi (; 7 February 190617 October 1967), of the Manchu Aisin Gioro clan, commonly known as Pu Yi, was the last Emperor of China, the second-to-last Khan of Mongolia and the twelfth and final ruler of the Qing dynasty. When a child, he ruled as the Xuantong Emperor () in China and Khevt Yos Khaan in Mongolia from 1908 until his forced abdication on 12 February 1912, after the successful Xinhai Revolution. From 1–12 July 1917, he was briefly restored to the throne as emperor by the warlord Zhang Xun.
Document 13: Emperor Mozhu of Western Xia: Emperor Mozhu ("last ruler") or Emperor Modi ("last emperor") of Western Xia was the last emperor of the Tangut-founded Western Xia dynasty and reigned from 1226 to 1227. His personal name was Lǐ Xiàn 李睍. His rule saw the destruction of the Western Xia as the Mongol forces under Genghis Khan overran and conquered it following the defiance and rebellion of earlier emperors.
Document 14: Sun Yat-sen: Sun Yat-sen ( ; 12 November 1866 – 12 March 1925) was a Chinese physician, writer, philosopher, calligrapher and revolutionary, the first president and founding father of the Republic of China. As the foremost pioneer of the Republic of China, Sun is referred to as the "Father of the Nation" in the Republic of China (ROC), Hong Kong, Macau and the "forerunner of democratic revolution" in People's Republic of China (PRC). Sun played an instrumental role in the overthrow of the Qing dynasty during the years leading up to the Xinhai Revolution. He was appointed to serve as Provisional President of the Republic of China when it was founded in 1912. He later co-founded the Nationalist Party of China, serving as its first leader. Sun was a uniting figure in post-Imperial China, and he remains unique among 20th-century Chinese politicians for being widely revered amongst the people from both sides of the Taiwan Strait.
Document 15: Museum of the Imperial Palace of the Manchu State: The Museum of the Imperial Palace of the Manchu State () is a museum in the northeastern corner of Changchun, Jilin province, northeast China. The Palace was the official residence created by the Imperial Japanese Army for China's last emperor Puyi to live in as part of his role as Emperor of the Japanese puppet state of Manchukuo. In the People's Republic of China the structures are generally referred to as the Puppet Emperor's Palace & Exhibition Hall. It is classified as a AAAAA scenic area by the China National Tourism Administration.
ground_truth: Puyi