Causes
Further information: History of the Han Dynasty and Society and culture of the Han DynastyA major cause of the rebellion was an agrarian crisis, in which famine forced many farmers and former military settlers in the north to seek employment in the south, where large landowners exploited the labor surplus to amass large fortunes. The situation was further aggravated by smaller floods along the lower course of the Yellow River. The peasants were further oppressed by high taxes imposed in order to fund the construction of fortifications along the Silk Road and garrisons against foreign infiltration and invasion. In this situation, landowners, landless peasants, and unemployed former-soldiers formed armed bands (around 170), and eventually private armies, setting the stage for armed conflict.
At the same time, the Han Dynasty central government was weakening internally. The power of the landowners had become a longstanding problem, but in the run-up to the rebellion, the court eunuchs in particular gained considerably in influence over the emperor, which they abused to enrich themselves. Ten of the most powerful eunuchs formed a group known as the Ten Attendants, and the emperor referred to one of them (Zhang Rang) as his "foster father". The government was widely regarded as corrupt and incapable and the famines and floods were seen as an indication that a decadent emperor had lost his mandate of heaven.
Because of its plan for a new beginning, the Taoist sect of Zhang Jue (also known as Zhang Jiao) was to prove the Han Dynasty's most dangerous enemy. In preparation for his revolt, Zhang Jue sent disciples out to gain support and organize followers throughout north China. They were helped by local political discontent, and by droughts and plague among the people. The rebels even had allies in the imperial court, and they were able to make their preparations while government officials were either ignorant of their intentions or intimidated by their power.
Zhang Jue planned a rising throughout the empire, but before the call to arms had been issued the plan was betrayed, the rebel sympathizers in Luoyang were arrested and executed, and the revolt in the provinces had to begin ahead of time, in the second month of 184. Despite the premature call and an inevitable lack of co-ordination, tens of thousands of men rose in rebellion, government offices were plundered and destroyed and the imperial armies were immediately forced onto the defensive.
Read more about this topic: Yellow Turban Rebellion