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. In other words, the domain was defined in terms of kokudaka, not land area. This was different than the feudalism of the West.
List of lords
- Mass, Jeffrey P. and William B. Hauser. (1987). The Bakufu in Japanese History, p. 150.
- Elison, George and Bardwell L. Smith (1987). Warlords, Artists, & Commoners: Japan in the Sixteenth Century, p. 18.
- (Japanese) Koga on "Edo 300 HTML" (20 Oct. 2007)
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