Development
According to the Shoku Nihongi, the Izumi and Hine districts were separated from Kawachi Province on 23 April 716; moreover, on 8 May that same year, the Ōtori District was also separated from Kawachi, and the three districts constructed Izumi-gen (和泉監?). The imperial villa of Chinu Palace (茅渟宮, Chinu no Miya?, also known as Izumi Palace) was in Izumi, and it seems that this has something to do with the unusual classification of gen (監?): Yoshino-gen was the only other province with this designation. Afterwards, on 15 September 740, it was abolished and merged back into Kawachi province. On 30 May 757, it was re-established with a normal province designation kuni (国?).
According to the Nihongi Ryaku, on 21 April 825, the four Settsu Province districts of Higashinari, Nishinari, Kudara, and Sumiyoshi were incorporated into Izumi Province, but the residents were opposed to it, so they were restored to Settsu on 8 August the same year.
In the Edo period, Kishiwada Domain (Koide tozama, Matsudaira/Matsui fudai, Okabe fudai; 30000–60000 koku) and Hakata Domain (Watanabe fudai; 13500 koku) were established.
Sometime in 1870 or 1871 (the beginning of the Meiji era), the boundary with Settsu Province was changed to the Yamato River (it was formerly the roads of Ōshōji and Nagao Kaidō).
Read more about this topic: Izumi Province
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