Over 440 years ago, in the third year of Tenshō (1575), Oda Nobunaga dispatched a large army to suppress the Ikkō-ikki uprising in Echizen. At that time, he attacked Toyohara-dera, located 4 km northeast of present-day Maruoka, and burned down all the temple buildings. As a reward for this achievement, Nobunaga granted Shibata Katsuie control over the province of Echizen and ordered him to build a castle in Kita no Shō (modern-day Fukui City). Katsuie sent his nephew Katsutoyo to Toyohara, where he built Toyohara Castle. However, in the following year, Tenshō 4 (1576), Katsutoyo moved from Toyohara to Maruoka and constructed a new castle, which is the current Maruoka Castle.After Katsutoyo, the castle became the residence of Yasui Iekiyo, Aoyama Shūri-no-suke, Aoyama Tadamoto, Imamura Moritsugu, four generations of the Honda family led by Honda Narishige, and then eight generations of the Arima family, until the Meiji Restoration. From the mid-Taishō period to the early Shōwa period, the moats were filled in, and today, only the main keep, the tenshu, and part of the stone walls remain, with the site now serving as a park. The original castle grounds featured a wide, pentagon-shaped moat with samurai residences arranged on the outer perimeter. Additionally, rivers were used to create an outer moat that enclosed temples and civilian houses, forming a castle town.