jul 23, 1542 - In Japan, a six-year rebellion within the Date clan when clan leader Date Tanemune, returning home from a day of falconry, is attacked by his oldest son, Date Harumune, and imprisoned at Kōri-Nishiyama Castle in Fukushima Prefecture. Tanemune is rescued by an aide, Koyanagigawa Munetomo, and escapes. The war lasts for six years before Harumune triumphs and becomes the new leader of the Date clan