Koga Domain

A domain that ruled the area around Koga in Shimousa Province (Koga City, Ibaraki Prefecture). Fudai. In 1590 (Tensho 18), Tokugawa Ieyasu entered Edo Castle and granted Ogasawara Hidemasa 30,000 koku and Koga Castle. This marked the establishment of the Koga Domain. Later, Matsudaira (Toda) Yasunaga (20,000 koku), Ogasawara Nobuyuki and Masanobu (20,000 koku), Okudaira Tadamasa (110,000 koku), Nagai Naokatsu (72,000 koku) and Naomasa (more than 89,100 koku), were successively granted, but in 1633 (Kan'ei 10), the senior official Doi Toshikatsu was granted more than 160,000 koku, making it the largest domain of any daimyo in history. Toshikatsu's son Toshitaka inherited 135,000 koku, and his son Toshishige inherited 100,000 koku, so the family's holdings gradually decreased, but during this time four daimyo with shared domains were created. Toshishige was succeeded by his younger brother Toshihisa, but he died in 1675 (Enpo 3) at the age of 10 without an heir, and the family line came to an end. However, due to the hard work of his grandfather Toshikatsu, Toshitaka's son with a shared domain, Toshimasu, was allowed to inherit the family name and inherited 70,000 koku. In 1681 (Tenwa 1), Masatoshi Hotta, a senior councilor, was transferred to Toba in Shima (Mie Prefecture) with a fief of 90,000 koku, and the following year he was granted an additional 40,000 koku, giving him a fief of 130,000 koku. Masatoshi's son, Masanaka, inherited 100,000 koku, but was soon transferred to Yamagata in Dewa. They were succeeded by Matsudaira (Fujii) Nobuyuki (90,000 koku) and Tadayuki (80,000 koku, disappeared due to insanity), Matsudaira (Nagasawa, Okawachi) Nobuteru and Nobutoki (70,000 koku), Honda Tadayoshi and Tadahisa (50,000 koku), Matsudaira (Matsui) Yasuyoshi (more than 50,000 koku), and in 1762 (12th year of the Horeki era), Tosato, a descendant of Doi Toshikatsu, entered the domain again with 70,000 koku. Tosato moved the domain school Eikado from the Karatsu era to Koga. In 1822 (5th year of the Bunsei era), the senior councilor Toshiatsu was given an additional 10,000 koku, and thereafter there was no change until the domain was abolished. Toshitsura, the son of Toshiatsura (senior councilor), was known as a scholar along with the chief retainer, Senseki Takami. In 1871 (Meiji 4), the feudal domain was abolished, and the area was incorporated into Ibaraki Prefecture, passing through Koga Prefecture, Inba Prefecture, and Chiba Prefecture.

[Sadao Otani]

"Koga City Historical Materials: Early Modern Period (Dominic Government) (Town Region)" (1979, 83, Koga City)

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

下総(しもうさ)国古河（茨城県古河市）周辺を領有した藩。譜代(ふだい)。1590年（天正18）江戸城に入った徳川家康は、小笠原秀政(おがさわらひでまさ)に3万石を宛行(あてが)い古河城を与えた。これが古河藩の成立である。その後、松平（戸田）康長(やすなが)（2万石）、小笠原信之(のぶゆき)・政信(まさのぶ)（2万石）、奥平忠昌(おくだいらただまさ)（11万石）、永井直勝(なおかつ)（7万2000石）・尚政(なおまさ)（8万9100石余）と交代したが、1633年（寛永10）には老職土井利勝(としかつ)が16万石余で封ぜられ、歴代の大名のなかで最大の藩領を占めた。利勝の子利隆(としたか)は相続に際し13万5000石を領し、その子利重(とししげ)は10万石を相続したので、本家の領有高は次々と減少したが、この間4人の分知大名を創出した。利重の跡は弟利久(としひさ)が継いだが、1675年（延宝3）に10歳で死亡し嗣子(しし)なく、家は断絶した。しかし、祖父利勝の勤功によって、利隆の子で分知の利益(とします)が名跡を継ぐことを認められ7万石を相続した。利益は1681年（天和1）志摩(しま)（三重県）鳥羽(とば)に転封となり、老中堀田正俊(まさとし)が上野(こうずけ)（群馬県）安中(あんなか)より9万石で入り、翌年に4万石を加増され13万石を領有した。正俊の子正仲(まさなか)は10万石を相続したが、まもなく出羽山形に転じた。続いて松平（藤井）信之(のぶゆき)（9万石）・忠之(ただゆき)（8万石、狂気し断絶）、松平（長沢、大河内）信輝(のぶてる)・信祝(のぶとき)（7万石）、本多忠良(ただよし)・忠敞(ただひさ)（5万石）、松平（松井）康福(やすよし)（5万石余）と交代し、1762年（宝暦12）にふたたび土井利勝の子孫利里(としさと)が7万石で入部した。利里は唐津(からつ)時代の藩校盈科(えいか)堂を古河に移した。1822年（文政5）には老中利厚(としあつ)が1万石を加えられ、以後変化なく廃藩に至った。利厚の子利位(としつら)（老中）は家老鷹見泉石(たかみせんせき)とともに学者として知られる。71年（明治4）廃藩、古河県、印旛(いんば)県、千葉県を経て茨城県に編入。

［大谷貞夫］

『『古河市史資料　近世編（藩政）・（町方地方）』（1979、83・古河市）』

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