It is named after the Shinano Province of Japan, abbreviated Shinshu, and the city of Ueda, Nagano Prefecture.
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Arakawa was the original surname of the family which began calling itself "Ina clan" when it moved to the Ina region in Shinano Province in modern-day Nagano Prefecture.
The original surname of the family was "Arakawa", but the clan began calling itself "Ina" when it moved to the Ina region in Shinano Province in modern-day Nagano Prefecture.
It was a powerful clan of Shinano Province, particularly during the Sengoku period, when it had frequent clashes with its neighbor in Kai, the Takeda clan.
Masayori was the eldest son of Shinano warlord Takanashi Sumiyori and would mutually support his father's intent to restore their land after Takeda Shingen had claimed it as his own.