Daoguang Emperor

The Daoguang Emperor was the eighth emperor of the Manchuled Qing dynasty and the sixth Qing emperor to rule over China, from 1820 to 1850. His reign was marked by external disaster and internal rebellion, that is, by the First Opium War, and the beginning of the Taiping Rebellion which nearly brought down the dynasty. The historian Jonathan Spence characterizes the Daoguang Emperor as a well meaning but ineffective man, who promoted officials who presented a purist view even if they had nothing to say about the domestic and foreign problems surrounding the dynasty.

The Daoguang Emperor was born in the Forbidden City, Beijing, and was given the name Mianning . It was later changed to Minning when he became emperor The first character of his private name was changed from Mian to Min to avoid the relatively common character Mian. This novelty was introduced by his grandfather, the Qianlong Emperor, who thought it inappropriate to use a common character in the emperors private name due to the longstanding practice of naming taboo.

Source: Wikipedia