Koga Domain

Site of Koga Castle

The Koga Domain (古河藩 Koga-han) was a Japanese domain of the Edo period, located in Shimōsa Province (present-day Koga, Ibaraki). The first lord of Koga was Ogasawara Hidemasa, who was granted it as a fief following Tokugawa Ieyasu's move to the Kantō region.

In the han system, Koga was a political and economic abstraction based on periodic cadastral surveys and projected agricultural yields.^[1] In other words, the domain was defined in terms of kokudaka, not land area.^[2] This was different than the feudalism of the West.

List of lords

• Ogasawara clan (Fudai; 30,000 koku)

1. Hidemasa

• Matsudaira (Toda) clan (Fudai; 30,000 koku)

1. Yasunaga

• Ogasawara (Sakai) clan (Fudai; 20,000 koku)

1. Nobuyuki
2. Masanobu

• Okudaira clan (Fudai; 110,000 koku)

1. Tadamasa

• Nagai clan (Fudai; 72,000 koku)

1. Naokatsu
2. Naomasa

• Doi clan (Fudai; 160,000->135,000->100,000 koku)

1. Toshikatsu
2. Toshitaka
3. Toshishige
4. Toshihisa
5. Toshimasu

• Hotta clan (Fudai; 90,000 koku)

1. Masatoshi
2. Masanaka

• Matsudaira (Fujii) clan (Fudai; 90,000 koku)

1. Nobuyuki
2. Tadayuki

• Matsudaira (Ōkōchi) clan (Fudai; 70,000 koku)

1. Nobuteru
2. Nobutoki

• Honda clan (Fudai; 50,000 koku)

1. Tadayoshi
2. Tadahisa

• Matsudaira (Matsui) clan (Fudai; 50,000 koku)

1. Yasuyoshi

• Doi clan (Fudai; 70,000->80,000 koku)

1. Toshisato
2. Toshiakira
3. Toshiatsu
4. Toshitsura
5. Toshinao
6. Toshinori
7. Toshitomo

References

1. Mass, Jeffrey P. and William B. Hauser. (1987). The Bakufu in Japanese History, p. 150.
2. Elison, George and Bardwell L. Smith (1987). Warlords, Artists, & Commoners: Japan in the Sixteenth Century, p. 18.

External links

• (Japanese) Koga on "Edo 300 HTML" (20 Oct. 2007)