The Iwakitaira Domain (磐城平藩 Iwakitaira-han?) was a Japanese domain of the Tokugawa period. It is located in southern Mutsu Province, southern Hamadōri of present day. This domain is also called as the Iwakidaira Domain. The capital was Iwakitaira, pre-Sekigahara Iinodaira, present-day Iwaki City.
Before the battle of Sekigahara, southern Hamadōri was ruled by the Iwaki clan (岩城氏 Iwaki-shi?), its base was Iinodaira (飯野平 Iinodaira?). After the battle of Sekigahara, the Iwaki clan was banished to Kameda (present-day northern part of Yurihonjō), the former realm of the Iwaki clan was given to Torii Tadamasa. Tadamasa hated the Iwaki clan because of the hostility to the Tokugawa clan, renamed Iinodaira to Iwakitaira (磐城平 Iwakitaira?) with changing the character of "Iwa" from "岩" to "磐".
From the foundation to the dissolution, rulers were friends of the Tokugawa clan. The last rulers were of the Andō clan. The original role of the Iwakitaira Domain was the guarding to the Date clan whose base was Sendai.
The another name of the Iwakitaira Castle is the Dragon Castle (竜ヶ城 Ryūgajō?), it was called that "A famous site of Iwakitaira is the three-storied tower which stands afloat on the dragon's moat.".
Southern neighbor was the Mito Domain which was ruled by the Mito Tokugawa clan, it played the same role of the Iwakitaira Domain. Northern neighbor was the Nakamura Domain which was ruled by the Sōma clan.
List of lords
- List of Han
- Iwaki clan
- Iwaki, Fukushima
- Kanō Domain : the former domain of the Andō clan.
- Mito Domain
- Sōma Domain (Nakamura Domain)
- Sendai Domain
- Jansen, Marius B. (1994). Sakamoto Ryōma and the Meiji Restoration, p. 401.
- Sasaki Suguru (2004). Boshin Sensō 戊辰戦争. Tokyo: Chuokōron-shinsha.
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