Tōdō Takatora
This castle was constructed by Tōdō Takatora, a local "daimyō". He collected superior knowledge and techniques for building castles from 1602 to 1604 in order to build his own castle. The original major castle to rule the area was Kokufu Castle located on the top of Mount Karako. However, Takatora thought the Kokufu Castle was not in the best place for the governance of the area, so he abolished the old castle and made a new one, Imabari Castle.