All corrections
Wikipedia May 17, 2026 at 12:17 AM

en.wikipedia.org/wiki/Magatama#Yasakani_no_Magatama

2 corrections found

1
Claim
to offer tribute to the Northern Wei court
Correction

This is an anachronism: Iyo’s mission belonged to the Cao Wei / successor Jin era, not Northern Wei. Northern Wei was founded much later, in 386 CE.

Full reasoning

The article places Queen Iyo immediately after Himiko, i.e. in the 3rd century. That timing is incompatible with Northern Wei, which did not exist until 386 CE.

A source on Toyo/Iyo explains that the relevant account is in the Records of Wei (the history of the Cao Wei Kingdom, 220–265) and adds that an emissary of the Queen of Wa brought tribute to Jin in 266. In other words, the diplomatic context here is late Cao Wei / early Jin, not Northern Wei.

A standard reference on Northern Wei dates that dynasty to 386–534/535 CE, more than a century after Iyo’s 3rd-century mission. So calling the recipient court the "Northern Wei court" is historically incorrect.

2 sources
  • Toyo - Japanese Wiki Corpus

    Toyo ... was said to have succeeded Himiko ... in the 3rd century ... in Gishiwajinden (account of the Wa people) section of the volume Records of Wei [history of Cao Wei Kingdom; 220 - 265 in China] ... 'Iyo sent Yasuku ... they went up to the capital of Wei and paid tribute ...' ... an emissary of the Queen of Wa brought tribute to Jin in 266.

  • Wei dynasty | History & Culture | Britannica

    Wei dynasty, (386–534/535 ce), the longest-lived and most powerful of the northern Chinese dynasties ...

2
Claim
238 millimetres (9.4 in) in length
Correction

The tumulus is about 238 meters long, not 238 millimetres. The article appears to have a unit typo that shrinks a giant kofun to less than 10 inches.

Full reasoning

This is almost certainly a unit error. A kofun burial mound cannot be only 238 millimetres (9.4 inches) long, and authoritative descriptions of Muro Miyayama Kofun give its length as 238 m.

Nara Prefecture’s cultural-resource database describes Muro Miyayama Kofun as a large keyhole-shaped tomb with "墳長238m" (a mound length of 238 meters). A Japanese reference page on the same tumulus likewise says "The length of the tumulus is 238 m."

So the page’s wording should be in meters, not millimetres.

2 sources
Model: OPENAI_GPT_5 Prompt: v1.16.0