|Emperor of Japan|
|Reign||3 October 585 – 21 May 587|
|Died||21 May 587(aged 68–69)|
Kōchi no Shinaga no hara no misasagi (河内磯長原陵) (Osaka)
|House||Imperial House of Japan|
|Mother||Soga no Kitashihime|
Yōmei's reign spanned the years from 585 until his death in 587.
He was called Tachibana no Toyohi no Mikoto (橘豊日尊) in the Kojiki. He was also referred to as Prince Ōe (大兄皇子 Ōe no Miko) and Prince Ikebe (池辺皇子 Ikebe no Miko) after the palace in which he lived. He acceded to the throne after the death of his half brother, Emperor Bidatsu.
The influential courtiers from Emperor Bidatsu's reign, Mononobe no Moriya, also known as Mononobe Yuge no Moriya no Muraji or as Ō-muraji Yuge no Moriya, and Soga no Umako no Sukune, both remained in their positions during the reign of Emperor Yōmei. Umako was the son of Soga Iname no Sukune, and therefore, he would have been one of Emperor Yōmei's cousins.
- 585: In the 14th year of Bidatsu-tennō's reign (敏達天皇14年), he died; and the succession was received by his younger brother. Shortly thereafter, Emperor Yōmei is said to have acceded to the throne.
Yōmei's contemporary title would not have been tennō, as most historians believe this title was not introduced until the reigns of Emperor Tenmu and Empress Jitō. Rather,it was presumably Sumeramikoto or Amenoshita Shiroshimesu Ōkimi (治天下大王), meaning "the great king who rules all under heaven". Alternatively, Yōmei might have been referred to as ヤマト大王/大君 or the "Great King of Yamato".
Emperor Yōmei's reign lasted only two years; and he died at the age of 69.
- 587, in the 4th month: Yōmei died and his body was placed in a coffin, but not buried.
- 587, in the 5th month: Armed conflict over the succession erupted. Shintoist, anti-Buddhist forces of Yuge no Moriya no Muraji (also known as Ō-muraji Yuge no Moriya) battled unsuccessfully against the pro-Buddhist forces of Prince Shōtoku and Soga Umako no Sukune. The opposition to Buddhism was entirely destroyed.
- 587, in the 7th month: The body of former Emperor Yōmei was buried.
Because of the brevity of his reign, Emperor Yōmei was not responsible for any radical changes in policy, but his support of Buddhism created tension with supporters of Shintoism who opposed its introduction. According to Nihon Shoki, Emperor Yomei believed both in Buddhism and Shintoism. Moriya, the most influential supporter of Shintoism, conspired with Emperor Yōmei's brother, Prince Anahobe, and after Emperor Yomei's death they made an abortive attempt to seize the throne. Although Emperor Yōmei is reported to have died from illness, this incident and the brevity of his reign have led some to speculate that he was actually assassinated by Moriya and Prince Anahobe.
In 586, Emperor Yōmei took his half-sister Princess Anahobe no Hashihito (穴穂部間人皇女 Anahobe no Hashihito no Himemiko), whose mother was another of Iname's daughters, Soga no Oane Hime, as his consort. Princess Hashihito no Anahobe bore him four sons.
Empress: Princess Anahobe no Hashihito (穴穂部間人皇女, d.622), Emperor Kinmei's daughter
- Second Son: Prince Umayado (厩戸皇子), later Prince Shōtoku, regent to Empress Suiko
- Fourth Son: Prince Kume (来目皇子, d.603)
- Fifth Son: Prince Eguri (殖栗皇子)
- Sixth Son: Prince Mamuta (茨田皇子, 579-643)
Concubine: Soga no Ishikina (蘇我石寸名), Soga no Iname's daughter
- First Son: Prince Tame (田目皇子)
Consort: Katsuragi Hiroko (葛城広子), Katsuragi no Atahe's daughter
- Third Son: Prince Maroko (当麻皇子, 574-586)
- Princess Sukatehime (酢香手姫皇女)
Yomei had three Empresses and seven Imperial sons and daughters.
- Imperial Household Agency (Kunaichō): 用明天皇 (31)
- Ponsonby-Fane, Richard. (1959). The Imperial House of Japan, p. 46.
- Brown, Delmer et al. (1979). Gukanshō, p. 263; Titsingh, Isaac. (1834). Annales des empereurs du Japon, pp. 37–38., p. 37, at Google Books
- Titsingh, p. 37; Brown, pp. 263; Varley, p. 44; n.b., A distinct act of senso is unrecognized prior to Emperor Tenji; and all sovereigns except Jitō, Yōzei, Go-Toba, and Fushimi have senso and sokui in the same year until the reign of Emperor Go-Murakami.
- Varley, H. Paul. (1980). Jinnō Shōtōki, p. 126.
- Brown, p. 263.
- Brown, pp. 262–263.
- Ponsonby-Fane, p. 419.
- Varley, p. 125.
- "Genealogy". Reichsarchiv (in Japanese). Retrieved 25 January 2018.
- Aston, William George. (1896). Nihongi: Chronicles of Japan from the Earliest Times to A.D. 697. London: Kegan Paul, Trench, Trubner. OCLC 448337491
- Brown, Delmer M. and Ichirō Ishida, eds. (1979). Gukanshō: The Future and the Past. Berkeley: University of California Press. ISBN 978-0-520-03460-0; OCLC 251325323
- Ponsonby-Fane, Richard Arthur Brabazon. (1959). The Imperial House of Japan. Kyoto: Ponsonby Memorial Society. OCLC 194887
- Titsingh, Isaac. (1834). Nihon Ōdai Ichiran; ou, Annales des empereurs du Japon. Paris: Royal Asiatic Society, Oriental Translation Fund of Great Britain and Ireland. OCLC 5850691
- Varley, H. Paul. (1980). Jinnō Shōtōki: A Chronicle of Gods and Sovereigns. New York: Columbia University Press. ISBN 978-0-231-04940-5; OCLC 59145842
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