In the "hon-maru", there were some Shinto shrines, as in the case of many other castles in Japan. On the west of the foundation of the "dai-tenshu" (large donjon), there was a Niyakuichioji Shrine. This shrine was a branch of the Kego Shrine, which was dedicated to three gods of war. In Meiwa 5 (1768), the Seisho-Gongen Shrine was built to the east of the foundation of the "dai-tenshu" to deify Kuroda Nagamasa, and in An'ei 2 (1773) the Suikyo-Gongen Shrine was raised to honor Kuroda Yoshitaka in the same building. Both shrines are still in existence in their new location in Nishi-koen Park (on Arato-yama hill) as one shrine, today called the "Terumo Shrine."