Bidam’s Rebellion
The chief minister Bidam rebelled, claiming a queen could not rule, and was crushed by Kim Yu-sin and Kim Chun-chu.

Seefooddiet · CC BY-SA 4.0 · Source
Bidam was the sangdaedeung, head of the noble council. With Yeomjong and others he raised troops at Myeonghwal Fortress. When a great star fell on Wolseong and frightened the royal troops, Kim Yu-sin is said to have sent a burning effigy aloft on a kite and spread word that the star had risen again.
Queen Seondeok died during the revolt and Queen Jindeok succeeded her; Bidam and some thirty others were executed. The victors, Kim Chun-chu and Kim Yu-sin, took control, opening the way to Kim Chun-chu’s accession.