Chinese dynasties in the context of "Chang'an"

The Xiongnu (Chinese: 匈奴, [ɕjʊ́ŋ.nǔ]) were a tribal confederation of nomadic peoples who, according to ancient Chinese sources, inhabited the eastern Eurasian Steppe from the 3rd century BC to the late 1st century AD. Modu Chanyu, the supreme leader after 209 BC, founded the Xiongnu Empire.

After overthrowing their previous overlords, the Yuezhi, the Xiongnu became the dominant power on the steppes of East Asia, centred on the Mongolian Plateau. The Xiongnu were also active in areas now part of Siberia, Inner Mongolia, Gansu and Xinjiang. Their relations with the Chinese dynasties to the south-east were complex—alternating between various periods of peace, war, and subjugation. Ultimately, the Xiongnu were defeated by the Han dynasty in a centuries-long conflict, which led to the confederation splitting in two, and forcible resettlement of large numbers of Xiongnu within Han borders. During the Sixteen Kingdoms era, listed as one of the "Five Barbarians", their descendants founded the dynastic states of Han-Zhao, Northern Liang and Helian Xia and during the Northern and Southern dynasties founded Northern Zhou (founded by members of the Yuwen tribe of Xiongnu origin) in northern China.

Sinocentrism refers to a worldview that China is the cultural, political, or economic center of the world. Sinocentrism was a core concept in various Chinese dynasties. The Chinese considered themselves to be "all-under-Heaven", ruled by the emperor, known as Son of Heaven. Those that lived outside of the Huaxia were regarded as "barbarians". In addition, states outside of China, such as Vietnam, Japan or Korea, were considered to be vassals of China.

Chinese units of measurement, known in Chinese as the shìzhì ("market system"), are the traditional units of measurement of the Han Chinese. Although Chinese numerals have been decimal (base-10) since the Shang, several Chinese measures use hexadecimal (base-16). Local applications have varied, but the Chinese dynasties usually proclaimed standard measurements and recorded their predecessor's systems in their histories.

In the present day, the People's Republic of China maintains some customary units based upon the market units but standardized to round values in the metric system, for example the common jin or catty of exactly 500 g. The Chinese name for most metric units is based on that of the closest traditional unit; when confusion might arise, the word "market" (市, shì) is used to specify the traditional unit and "common" or "public" (公, gōng) is used for the metric value. Taiwan, like Korea, saw its traditional units standardized to Japanese values and their conversion to a metric basis, such as the Taiwanese ping of about 3.306 m based on the square ken. The Hong Kong SAR continues to use its traditional units, now legally defined based on a local equation with metric units. For instance, the Hong Kong catty is precisely 604.78982 g.

The Music Bureau (Traditional Chinese: 樂府; Simplified Chinese: 乐府; Hanyu Pinyin: yuèfǔ, and sometimes known as the "Imperial Music Bureau") served in the capacity of an organ of various imperial government bureaucracies of China: discontinuously and in various incarnations, the Music Bureau was charged directly, by the emperor (or other monarchical ruler), or indirectly, through the royal (or imperial) government to perform various tasks related to music, poetry, entertainment, or religious worship. These tasks included both musical and lyrical research and development, and also directing performances.

The existence of a Music Bureau was typical of various Chinese dynasties, though the Music Bureau's prominence and influence may have peaked during the reign of Han dynasty emperor Wu, who was especially interested in such activities and engaged himself accordingly. The mission of the Music Bureau was concerned with poetry, music, and their live performances, because these concepts were not really considered to be distinct: lyrics are a part of music, and traditional Chinese poems, particularly shi, were considered to be suitable for chanting or singing, and poetic verses in accompaniment with instrumental music were often presented together as integral parts of performances. In the case of the Music Bureau, performances were oriented towards religious rites or entertainment in service to the emperor.

Jian'an District (Chinese: 建安区; pinyin: Jiàn'ān Qū), formerly Xuchang County (许昌县) is a district of the prefecture of Xuchang in Henan Province, China. The district is named for Jian'an, a famous Chinese era during the reign of Emperor Xian, the last emperor of the Han dynasty.