In order to make historical ends meet, the dispatch of troops to the Korean Peninsula, which led to the legend of sankan-seibatsu (the conquest of three countries in old Korea), was said to have taken place in the mid fourth century (presumably in 369, calculated by adding two rounds of the Oriental zodiac [120 years] to the year of 249 as stated in Nihonshoki) and this area was considered as the directly controlled land of the king of Wa (Japan) ever since.
そのため三韓征伐のモデルとなった朝鮮半島への出兵を4世紀半ば（神功皇后49年（249年）を干支2巡繰り上げたものと見て369年と推定する）とし、以降、当地域は倭王の直轄地であったとした。