Like the emperors of the Ming dynasty, Qing monarchs used only one reign name and are usually known by that name, as when we speak of the "Qianlong Emperor" (r. 1735–1795) or the "Guangxu Emperor" (r. 1875–1908). Strictly speaking, referring to the Qianlong Emperor simply as "Qianlong" is wrong, because "Qianlong" was not that emperor's own name but that of his reign era. For convenience sake, however, many historians still choose to call him Qianlong (though not "Emperor Qianlong"). The only Qing emperors who are not commonly known by their reign name are the first two: Nurhaci (r. 1616–1626), who is known by his personal name, and his son and successor Hong Taiji (r. 1626–1643), whose name was a title meaning "prince Hong". Hong Taiji was the only Qing emperor to use two era names (see table).