Ruzi Ying
Ruzi Ying (; 5 – 25), 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 Gengshi Emperor 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.)
History of the Han dynasty
From 26–30 CE, Guangwu defeated various warlords and conquered the Central Plain and Shandong Peninsula in the east. Allying with the warlord Dou Rong (竇融) of the distant Hexi Corridor in 29 CE, Guangwu nearly defeated the Gansu warlord Wei Xiao (隗囂/隗嚣) in 32 CE, seizing Wei's domain in 33 CE. The last adversary standing was Gongsun Shu (公孫述), whose base was at Chengdu in modern Sichuan. Although Guangwu's forces successfully burned down Gongsun's fortified pontoon bridge stretching across the Yangzi River, Guangwu's commanding general Cen Peng (岑彭) was killed in 35 CE by an assassin sent by Gongsun Shu. Nevertheless, Han General Wu Han (d. 44 CE) resumed Cen's campaign along the Yangzi and Min rivers and destroyed Gongsun's forces by December 36 CE.
Since Chang'an is located west of Luoyang, the names Western Han (202 BCE – 9 CE) and Eastern Han (25–220 CE) are accepted by historians. Luoyang's 10 m (32 ft) tall eastern, western, and northern walls still stand today, although the southern wall was destroyed when the Luo River changed its course. Within its walls it had two prominent palaces, both of which existed during Western Han, but were expanded by Guangwu and his successors. While Eastern Han Luoyang is estimated to have held roughly 500,000 inhabitants, the first known census data for the whole of China, dated 2 CE, recorded a population of nearly 58 million. Comparing this to the census of 140 CE (when the total population was registered at roughly 48 million), there was a significant migratory shift of up to 10 million people from northern to southern China during Eastern Han, largely because of natural disasters and wars with nomadic groups in the north. Population size fluctuated according to periodically updated Eastern-Han censuses, but historian Sadao Nishijima notes that this does not reflect a dramatic loss of life, but rather government inability at times to register the entire populace.
Scrapping Wang Mang's denominations of currency, Emperor Guangwu reintroduced Western Han's standard five "shu" coin in 40 CE. Making up for lost revenue after the salt and iron monopolies were canceled, private manufacturers were heavily taxed while the government purchased its armies' swords and shields from private businesses. In 31 CE he allowed peasants to pay a military substitution tax to avoid conscription into the armed forces for a year of training and year of service; instead he built a volunteer force which lasted throughout Eastern Han. He also allowed peasants to avoid the one-month corvée duty with a commutable tax as hired labor became more popular. Wang Mang had demoted all Han marquesses to commoner status, yet Guangwu made an effort from 27 CE onwards to find their relatives and restore abolished marquessates.