Uchiyama Castle (内山城 Uchiyama-jō) is located in the mountains east of Saku City, Nagano Prefecture. The castle was most likely constructed in the early 16th century by the local Ōi (大井) clan who ruled the Saku district.
![Uchiyama Castle (内山城)]( "Uchiyama Castle (内山城)")
When Takeda Shingen (武田信玄, 1521-1573) invaded the Saku district in 1546, Ōi Sadakiyo (大井貞清, d. 1575) eventually surrendered...
Uchiyama Castle
When Takeda Shingen (武田信玄, 1521-1573) invaded the Saku district in 1546, Ōi Sadakiyo (大井貞清, d. 1575) eventually surrendered...
Uchiyama Castle