The Gwisil clan were a collateral branch of the royal family of the Korean kingdom of Baekje, one of the Three Kingdoms of Korea who settled in Japan. They descended from the third son of the 26th king, Seong of Baekje, whose name is unknown. The characters "鬼" and "室" literally mean "demon" and "house".
History
In 660, Baekje was attacked by the allied armies of Silla and the Tang dynasty of China who had made the Silla–Tang alliance. The capital, Sabi, was taken, but Boksin resisted near modern-day Yesan. After Uija of Baekje surrendered to Tang, Boksin and the monkDochim kindled a restoration movement known as the Baekje Revival Movement. They sent for the prince Buyeo Pung, who had been living as a hostage in Yamato period Japan, an important Baekje ally. With some Japanese aid, they gathered the remnants of the Baekje army and launched a series of attacks on the Silla-Tang forces. In 663, Silla and Tang counterattacked, and besieged the restoration movement at a fortress known as Juryu Castle now in Seocheon County, South Chungcheong. At this point Boksin appears to have betrayed the restoration movement. He had Dochim killed and sought to slay Prince Pung as well. However, Pung killed him first, and fled to Goguryeo. The restoration movement was destroyed shortly thereafter at the Battle of Baekgang.
** Mokuto-Ō - grandson of King Seong, the Korean reading of his name is "Mokdo-wang". He is ancestor of the Oka no muraji clan.
*** Oka no muraji no Anki - known in Baekje as Angwi.
**** Gwisil Jeongin - father of Boksin, seems to be first to take the name "Gwisil".
***** Gwisil Boksin - son of Jeongin, general of Baekje who is known for the revival movement. In Japan he was called "Kishitsu Fukushin" by the Japanese reading of his characters.
****** Gwisil Jipsin - son of Boksin, older brother of Jipsa, settled in Japan after the fall of Baekje. In Japan he was called "Kishitsu Shushin" by the Japanese reading of his characters.
****** Gwisil Jipsa - settled in Japan after the fall of Baekje and was appointed Head of Education. In Japan he was called "Kishitsu Shushi" by the Japanese reading of his characters.
***** Gwisil Bokeung, brother of Boksin, ancestor of the Oka clan and the clan.
