Izushi Domain

Despite being on the losing side of the war, Tokugawa Ieyasu forgave the Koide clan as Hidemasa's second son, Koide Hideie, served in the Eastern Army with a force of 300 cavalrymen at his father's behest, and distinguished himself greatly against the Uesugi clan and at the Battle Sekigahara.

On Hidemasa's death in 1604, Yoshimasa was transferred to Kishiwada, which was increased to 50,000 koku, and Izushi went to his son, Koide Yoshifusa.

Under the 7th daimyō, Sengoku Hisatoshi, the domain was beset by peasant's revolts on two occasions.

The first revolt, in 1835, was serious enough to warrant direct intervention by the shogunate, and resulted in the domain being punished by a reduction in its kokudaka from 58,000 to 30,000 koku.

Unlike most domains in the han system, which consisted of several discontinuous territories calculated to provide the assigned kokudaka, based on periodic cadastral surveys and projected agricultural yields, Toyooka Domain was a single unified holding.