The Iwai Rebellion (磐井の乱 Iwai no Ran) was a rebellion against the Yamato court that took place in Tsukushi, Japan (now nearby Ogori city in Fukuoka Prefecture) in 527 AD. The rebellion was named after its leader, Iwai, who is believed by historians to have been a powerful governor of Tsukushi. The rebellion was quelled by the Yamato court, and played an important part in the consolidation of early Japan. The main record of the rebellion can be found in the Nihon Shoki, although it is also mentioned in Kojiki and other historical sources.
The Cambridge History of Japan: Ancient Japan (Google Books)