Honda Tadakatsu
The temple was built in 1595 by Tadakatsu. Ieyasu granted Honda Tadakatsu the Ōtaki Domain, and he constructed the "jōkamachi", or castle town, of Ōtaki Castle. Tadakatsu placed the temple in a strategically defensive position in the Shinmachi District above the Isumi River to protect the castle town from the south. The temple was originally called but was renamed Ryōgen-ji, the name by which it is known today, after the death of Honda Tadakatsu.