The Empress of Japan is the title given to the wife of the Emperor of Japan or a female ruler in her own right. In Japanese, the empress consort is called . The current empress consort is Empress Masako, who ascended the throne with her husband on 1 May 2019. Much like their male counterparts, female rulers who ascend the throne by their birthright are referred to as 天皇 (tennō), but can also be referred to as 女性天皇 (josei tennō) or 女帝 (jotei). josei tennō refers only to an empress regnant of Japan, and jotei refers to an empress regnant of any countries. Empresses regnant There were eight female imperial reigns (six female emperors including two who reigned twice) in Japan's early history between 593 and 770, and two more in the early modern period (Edo period). Although there were eight reigning empresses, with only one exception their successors were selected from amongst the males of the paternal Imperial bloodline. After many centuries, female reigns came to be officially prohibited only when the Imperial Household Law was issued in 1889 alongside the new Meiji Constitution. The eight historical empresses regnant are: Nukatabe, Empress Suiko (推古天皇 Suiko Tennō) was the 33rd empress of Japan from 593 until 628, according to the traditional order of succession, and the first historically attested woman to hold this position. She was the granddaughter of Tashiraga of Yamato, herself sister of the childless Emperor Buretsu, transferring some legitimacy in succession to the throne of Yamato to her husband Emperor Keitai. Tashiraga's mother had been Kasuga of Yamato, sister of the childless Emperor Seinei, whose own marriage with the future Emperor Ninken had a similar effect a generation earlier. According to legends, these ladies descended from the legendary Empress Jingū, who had been ruler (since Meiji-era rewrites of history, Regent) of Yamato for decades at some time in the past, probably in the mid-4th century (if she really existed), and who herself descended, according to legends, from Amaterasu omikami, the Sun Goddess of the Japanese pantheon. Takara, Empress Kōgyoku (皇極天皇 Kōgyoku Tennō), also Empress Saimei (斉明天皇 Saimei Tennō) was the 35th and 37th empress of Japan, initially from February 18, 642, to July 12, 645, ascending upon the death of her uncle Emperor Jomei (who had also been her second husband). When she abdicated, her own younger brother succeeded her. However, upon the death of the said