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Ono no Imoko (小野 妹子) was a Japanese politician and diplomat in the late 6th and early 7th century, during theAsuka period.^[1]

Ono was appointed byEmpress Suiko as an official envoy (Kenzuishi) to theSui court in 607 (imperial embassies to China), and he delivered the famous letter from Japan'sPrince Shōtoku which began "The Son of Heaven where the sun rises [Japan], to the Son of Heaven where the sun sets [China], may good health be with you."Emperor Yang was angered at being addressed in this way, although it is not clear whether he was angered more by the insult of Sui being referred to as the land of the setting sun, or by the use ofSon of Heaven to refer both to himself and the emperor of Japan, hinting that they were equals. China at this time considered other realms to be nothing more thanbarbarians before theHuaxia ideology and any lands on the Earth's surface not engaged at the Sinocentrictributary system were calledHuàwài zhī dì (化外之地; "lands outside of civilization"), theEmperor of China was considered the only legitimateemperor of the entire world (all landsunder heaven) and the Japanese use of the same Chinese characters for Emperor ("son of heaven") was a subversion of this principle andChinese theocracy.^[2] Nevertheless, Emperor Yang was probably more interested in diplomatically distancing Japan fromGoguryeo and getting support from Japan for being the other powerful kingdom besides Goguryeo inNortheast Asia than in matters of decorum, and despite the insult, he sent his own envoy, Pei Shiqing (裴世清), back to Japan with Ono. Goguryeo for years raided and assaulted Chinese borders, in an ill-fated attempt to subjugate the kingdom in the north, the Sui dynasty later collapsed from unfavorable political opinion generated by theGoguryeo-Sui War and other causes.

Ono was then appointed envoy to Sui for a second time in the fall of 608 and accompanied Pei Shiqing on his return trip to China. Ono returned to Japan from his second mission in 609 and then largely disappeared from the historical record. Ono no Imoko is often cited as an example of an official who achieved promotion under the new meritoriousTwelve Level Cap and Rank System implemented by Prince Shōtoku in 603. When Ono first appeared in the historical record and was appointed envoy to Sui, his rank was listed as Greater Propriety (5th rank), but he was later promoted to the top rank of Greater Virtue, largely due to his successful missions to the Sui court.

Ono no Imoko's family was notable forlinguistics andscholarship, and the descendants of the family includeOno no Komachi, beautiful poetess;Ono no Takamura, poet and scholar; andOno no Michikaze,calligrapher.

• Nussbaum, Louis Frédéric and Käthe Roth. (2005).Japan Encyclopedia. Cambridge:Harvard University Press.ISBN 978-0-674-01753-5;OCLC 48943301

• Japanese politicians
• Ambassadors of Japan to China
• People of Asuka-period Japan
• Sui dynasty
• 6th-century Japanese people
• 7th-century Japanese people
• Deified Japanese men

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