Ruins of a Sengoku-period mountain castle in Nigioka-cho, Otsuki City, designated a city historic site. In 1582, when Takeda Katsuyori tried to escape Nobunaga's invasion of Kai, he was betrayed by the castle lord Oyamada Nobushige — an episode for which this castle is famous. Built atop Mt. Iwadono (634 m), the castle was an almost impregnable natural stronghold surrounded by sheer cliffs. The su…
Iwadono Castle is believed to have been constructed around the Oei era (1394–1428) of the Muromachi period, perched atop the rugged rocky summit of Mt. Iwadono (634 m). During the Sengoku period, it served as the stronghold of the Oyamada clan, a powerful local lord of Kai Province, and is said to h…
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