Gwisil clan

The Gwisil clan (Kwi-sil; 鬼室氏, Japanese: Kishitsu) 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.

[1] In 660, Baekje was attacked by the allied armies of Silla and the Tang dynasty of China who had made the Silla–Tang alliance.

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.

[2] In 663, Silla and Tang counterattacked and besieged the restoration movement at a fortress known as Juryu Castle (Juryu-seong, 주류성/周留城) now in Seocheon County, South Chungcheong.