So, the titles of female monarchs in East Asia are the same as those of male monarchs, just indicating that they are women. In China, the term nǚhuángdì (女皇帝, "female emperor"), abbreviated as nǚhuáng (女皇), has been used for three empresses regnant to assume the title of huángdì: Daughter of Xiaoming, Chen Shuozhen and Wu Zetian, because the title huánghòu (皇后, "emperor's consort") means only an empress consort. The term nǚwáng (女王, "female king") was also used for queens regnant of Sumpa and it is different from the title wánghòu (王后, "king's consort") which means a queen consort. In Korea, the term yeowang (여왕, "female king") was developed to refer to three queens regnant of Silla: Seondeok, Jindeok and Jinseong, because the title wangbi (왕비, "king's consort") means only a queen consort. The term yeoje (여제, "female emperor") was also used for Yi Hae-won, the titular empress regnant of Korean Empire because the title hwanghu (황후, "emperor's consort") means only an empress consort. Although Vietnam is a country in Southeast Asia, it used the royal titles of East Asia. The title as a queen regnant of Trưng Trắc was Nữ vương ("female king") and the title as an empress regnant of Lý Chiêu Hoàng was Nữ hoàng ("female emperor"), and they are different from the titles of female consorts. In Japan, the title used for two queens regnant of Yamatai: Himiko and Toyo was joō (女王, "female king") and it is different from the title ōhi (王妃, "king's consort") which means only a queen consort. The term josei tennō (女性天皇, "female emperor") has been used for empresses regnant of Japan because the title kōgō (皇后, "emperor's consort") means only an empress consort. Although the Chrysanthemum Throne of Japan is currently barred to women following the Imperial Household Law (Emperor Naruhito has a daughter, Princess Aiko. She cannot accede to the Chrysanthemum Throne), this has not always been the case; throughout Japanese history, there have been eight empresses regnant. The Japanese imperial succession debate became a significant political issue during the early 2000s, as no male children had been born to the Imperial House of Japan since 1965. Prime Minister Junichirō Koizumi pledged to present parliament with a bill to allow women to ascend the Imperial Throne, but he withdrew this after the birth of Prince Hisahito (Naruhito's nephew) in 2006. List See also List of women rulers Monarch List of