道光 is the reign name (庙号/年号) of the sixth emperor of the Qing dynasty, ruling from 1821 to 1850. In historical contexts, it refers either to the emperor himself or the period of his rule. The name literally means 'brilliance of virtue,' but as a historical term it almost always functions as a proper noun referring to the Daoguang era — a time marked by the Opium Wars and the beginning of China's semi-colonial period. For learners encountering Chinese history texts, 道光 is a key reference point.