Lülin (綠林, Lǜlín) or Lülin Force (綠林兵) refers, as an umbrella term, to one of the two major agrarian rebellion movements against Wang Mang's Xin Dynasty in the modern southern Henan and northern Hubei region who banded together to pool their strengths, and whose collective strength eventually led to the downfall of the Xin Dynasty and the establishment of a temporary reinstatement of the Han Dynasty in the person of Liu Xuan (Emperor Gengshi) as the emperor. Many Lülin leaders became important members of Emperor Gengshi's government, but infighting and incompetence (both of the emperor and his officials) in governing the empire led to the fall of the regime after only two years, paving the way for the eventual rise of Liu Xiu (Emperor Guangwu) of the Eastern Han Dynasty. The name Lülin came from the Lülin Mountains (in modern Yichang, Hubei), where the rebels had their stronghold for a while.
Read more about Lülin: Start of The Rebellion, Temporary Breakup After Plague, Reunion and The Start of Political Ambition, Reestablishment of The Han Dynasty Under Emperor Gengshi, Battle of Kunyang, Initial Infighting and Liu Yan's Death, Destruction of Wang Mang and Subsequent Movement To Chang'an, Destruction of Emperor Gengshi's Regime