Iwatsuki Domain

Surviving rear gate of Iwatsuki Castle, administrative center of Iwatsuki Domain

Iwatsuki Domain (岩槻藩 Iwatsuki-han) was a feudal domain under the Tokugawa shogunate of Edo period Japan, located in Musashi Province (modern-day Saitama Prefecture), Japan. It was centered on Iwatsuki Castle in what is now part of Iwatsuki-ku, Saitama.


Iwatsuki was an important strongpoint of the Odawara Hojo clan. However, following the destruction of that clan at the Battle of Odawara of 1590, the territory came under the control of Tokugawa Ieyasu, who assigned a 20,000 koku domain to one of his most trusted retainers, Kōriki Kiyonaga. Following the Siege of Osaka, his grandson Kōriki Tadafusa was awarded with a promotion to the 35,000 koku Hamamatsu Domain in 1619. The following year, in 1620, the rōjū Aoyama Tadatoshi was awarded Iwatsuki with holdings of 55,000 koku. He subsequently fell from favor and was demoted to the 20,000 koku Ōtaki Domain in 1623.

Abe Masatsugu was transferred to Iwatsuki in 1638 from Odawara Domain. The Abe clan ruled Iwatsuki over the next five generations until 1681, gradually increasing their holdings to 95,000 koku. After their transfer to Miyazu Domain, they were replaced by Itakura Shigetane (1681-1682), Toda Tadamasa (1682-1686), Matsudaira Tadachika (1696-1697) Ogasawara Nagashige (1697-1710) and his son Ogasawara Nagahiro (1710-1711).

The Nagai clan was then awarded Iwatsuki, beginning with Nagai Naohiro in 1711 and lasting for three generations until the clan was transferred to Kanō Domain in 1756.

Ōoka Tadamitsu (1709–1760), a distant relative of Ōoka Tadasuke who had started as a 300 koku hatamoto, rose rapidly through the ranks and was eventually awarded Iwatsuki and 20,000 koku in 1756. His descendants remained at Iwatsuki until the Meiji Restoration. The final daimyō of Iwatsuki, Ōoka Tadatsura (1847–1920) sided with the pro-imperial forces in the Boshin War and made a viscount (shishaku) in the kazoku peerage system in the Meiji period.

The domain had a population of 38,404 people in 6,962 households per a census in 1870.[1]

Holdings at the end of the Edo period

As with most domains in the han system, Iwatsuki Domain consisted of several discontinuous territories calculated to provide the assigned kokudaka, based on periodic cadastral surveys and projected agricultural yields.[2][3]

List of daimyō

#Name Tenure Courtesy title Court Rank kokudaka
Kōriki clan (fudai) 1590-1619
1Kōriki Kiyonaga (高力 清長)1590–1600 Kawachi-no-kami (河内守) Lower 5th (従五位下) 20,000 koku
2Kōriki Tadafusa (高力 正長)1600–1619 Sakon-no-taifu (左近大夫) Lower 5th (従五位下) 20,000 koku
Aoyama clan (fudai) 1620-1623
1Aoyama Tadatoshi (青山忠俊)1620-1623Hōki-no-kami (伯耆守) Lower 5th (従五位下) 55,000 koku
Abe clan (fudai) 1623-1681
1Abe Masatsugu (阿部正次)1623–1638Bitchu-no-kami (備中守) Lower 4th (従四位下) 55,000->86.000 koku
2Abe Shigetsugu (阿部 重次)1638–1651 Yamashiro-no-kami (山城守) Lower 5th (従五位下) 59,000->99,000 koku
3Abe Sadataka (阿部 定高)1652–1659Bitchu-no-kami (備中守) Lower 5th (従五位下) 99,000->115,000 koku
4Abe Masaharu (阿部 正春)1659–1671 Iyo-no-kami (伊予守) Lower 5th (従五位下) 115,000->99,000 koku
5Abe Masakuni (阿部 正邦)1671–1681 Tsushima-no-kami (対馬守) Lower 5th (従五位下) 99,000 koku
Itakura clan (fudai) 1681-1682
1Itakura Shigetane (板倉 重種)1681-1682Naizen-no-shō (内膳正) Lower 4th (従四位下) 60,000 koku
Toda clan (fudai) 1682-1686
1Toda Tadamasa (戸田 忠昌)1682-1686 Iyo-no-kami (伊予守) ; Jijū (侍従) Lower 5th (従五位下) 60,000 koku
Fujii-Matsudaira clan (fudai) 1686-1697
1Matsudaira Tadachika (松平 忠周)1686-1697 Iga-no-kami (伊賀守) :Jijū(侍従) Lower 4th (従四位下) 60,000 koku
Ogasawara clan (fudai) 1697-1711
1Ogasawara Nagashige (小笠原 長重)1697-1710 Sado-no-kami (佐渡守) ; Jijū (侍従) Lower 4th (従四位下) 50,000 koku
2Ogasawara Nagahiro (小笠原 長煕)1710–1711 Yamashiro-no-kami (山城守) Lower 5th (従五位下) 50,000 koku
Nagai clan (fudai) 1711-1756
1Nagai Naohiro (永井 直敬)1711-1711Iga-no-kami (伊賀守) Lower 5th (従五位下) 33,000 koku
2Nagai Naohira (永井 尚平)1711–1714Iga-no-kami (伊賀守) Lower 5th (従五位下) 33,000 koku
3Nagai Naonobu (永井 直陳)1714–1756 Iga-no-kami (伊賀守) Lower 5th (従五位下) 33,000 koku
Ōoka clan (fudai) 1756-1871
1Ōoka Tadamitsu (大岡 忠光)1756–1760 Izumo-no-kami (出雲守) Lower 4th (従四位下) 20,000 koku
2Ōoka Tadayoshi (大岡 忠喜)1760–1782 Hyōgo-no-kami (兵庫頭) Lower 5th (従五位下) 20,000 koku
3Ōoka Tadatoshi (大岡 忠要)1782–1786 Shikibu-no-shō (式部少輔) Lower 5th (従五位下) 20,000 koku
4 Ōoka Tadayasu (大岡 忠烈)1786–1797Tango-no-kami (丹後守) Lower 5th (従五位下) 20,000 koku
5Ōoka Tadamasa (大岡 忠正)1797–1816Shuzen-no-kami (主膳正) Lower 5th (従五位下) 20,000 koku
6Ōoka Tadakata (大岡 忠固)1816–1856Shuzen-no-kami (主膳正) Lower 5th (従五位下) 20,000 ->22,000 koku
7Ōoka Tadayuki (大岡 忠恕)1816–1856 Hyōgo-no-kami (兵庫頭)Lower 5th (従五位下) 22,000 koku
8Ōoka Tadatsura (大岡 忠貫)1856–1871Shuzen-no-kami (主膳正) Lower 5th (従五位下) 22,000 koku


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