Ushiku Domain

In 1590 after the victory of Toyotomi Hideyoshi in the Siege of Odawara, Akai Teruko was rewarded with a territory of 5,435 koku in Ushiku, Ibaraki.

However, he fell afoul of the Tokugawa shogunate when he arranged the marriage of his son and heir, Yamaguchi Shigenobu to a daughter of Ōkubo Tadachika without bothering to ask for permission first.

After apologizing, and after the death of Shigenobu in combat during the Siege of Osaka as a common soldier, Ieyasu relented and restored him to a 15,000 koku holding in Tōtōmi Province.

He traded this holding for an equivalent in Hitachi Province in 1628, marking the start of Ushiku Domain.

Shigemasa's fourth son and successor Yamaguchi Hirotaka constructed the jin’ya; however, he also divided 5,000 koku of the domain to his younger brother Shigetsune.