If it is strictly divided according to the historical timeline, Zhang Jiao is not a figure in the Three Kingdoms period. But the Yellow Turban Rebellion he led is historically considered one of the important events that led to the turmoil in the late Eastern Han Dynasty.
Zhang Jiao (?) -184), a native of Julu, Jizhou (now southwest of Pingxiang, Hebei), was the leader of the Taiping Dao in the late Eastern Han Dynasty and the leader of the Yellow Turban Uprising. Zhang Jiao was born in Julu, initially to teach ** spells and spells, founded the Taiping Dao, and later through the Fu Shui ** patient, in Qing (now northwest Shandong, Jiaodong), Xu (now southern Shandong, Jiangsu, north of the Yangtze River), You (now eastern Hebei, Liaoning), Hebei (now central Hebei, southern Hebei) and other eight states to develop hundreds of thousands of believers. Later, Zhang Jiao reorganized the believers, spread slogans in various places, and planned to start an incident. In the first year of Zhongping (184), after Qu Marshal Ma Yuanyi was killed for planning an uprising, Zhang Jiao launched the Yellow Turban Uprising and called on 360,000 people to act at the same time. However, Zhang Jiao was soon defeated by Lu Zhi by Beizhonglang, and was forced to retreat to Guangzong (now east of Weixian County, Hebei), and died of illness in the autumn and winter of the same year. 
Zhang Jiao and his two brothers, Zhang Bao and Zhang Liang, led a large rebel army, known as the "Taiping Dao". Their goal was to fight against the corrupt Eastern Han regime, and they attracted the support of a large number of peasants and the people at the bottom of society. The rebel army expanded rapidly and spread throughout China, posing a great threat to the Eastern Han regime.
The outbreak of the Yellow Turban Rebellion marked the beginning of the turbulent situation in the late Eastern Han Dynasty and is also regarded as the beginning of the Three Kingdoms era. Although the uprising was eventually suppressed by the Eastern Han Dynasty, it had a profound impact on the later political landscape. Zhang Jiao and his brothers' raising of the banner of rebellion revealed the deep-seated contradictions in the society at that time and laid the foundation for the future division of the people. As the saying goes, "the general trend of the world, if you join for a long time, you will be divided, and if you divide for a long time, you will be together", after that, there was a big drama of Wei, Shu and Wu "Romance of the Three Kingdoms" on the stage of Chinese history.