Emperor Xian of Han was the last emperor of the Han Dynasty in ancient China, ruling from 189 to 220 AD. His reign was marked by political instability and the decline of imperial power, as he was largely a puppet ruler under the influence of powerful warlords and court officials. During his reign, the Han Dynasty faced significant challenges, including corruption, rebellion, and the rise of the Three Kingdoms period. Ultimately, Emperor Xian was forced to abdicate in 220 AD, leading to the end of the Han Dynasty and the fragmentation of China into rival states.