お家騒動
In 1600, after the Tokugawa Ieyasu's victory at the Battle of Sekigahara, Uesugi Kagekatsu was deprived of his holdings in Aizu and was reassigned to the much smaller Yonezawa Domain in Dewa Province. The Aizu holding was reduced in half, and 600,000 "koku" was returned to Ieyasu's son-in-law, Gamō Hideyuki. However, the death of his son, Gamō Hidesato, in 1627 without a direct male heir provided an excuse for the Tokugawa shogunate to order the clan trade places with the Katō clan of the Matsuyama Domain in Iyo Province. The Gamō were replaced by Katō Yoshiaki, but reduced to 200,000 "koku". His son, Katō Akinari was dispossessed due to an "O-Ie Sōdō" (clan dispute) in 1643.