Refers to the period and styles associated with the rule of Wang Man in China, who usurped the Western Han throne in 9 CE, and ruled as sole emperor of the Xin dynasty until its capture in 23 CE. When the Liu family reasserted itself, Guangwudi ruled from 25-57 CE, making Luoyang the capital, about 100 kilometers east of Chang'an, about 15 kilometers from modern Luoyang in Henan Province. ——艺术与建筑索引典

Some scholars divide the Han into two sections. The period before Wang Mang’s usurpation—when the capital was in the western Chinese city of Chang’an (now Xi’an, Shaanxi province)—is called the Qian (Former), or Xi (Western) Han (206 bce–25 ce), and the period after Wang Mang—when the capital was moved eastward to Luoyang (in present-day Henan province—is named the Hou (Later), or Dong (Eastern), Han (25–220 ce).——Britannica Academic  @en