Kuroda Nagamasa
Located at the east gate is a very large stone built into the wall. According to legend, Katō Kiyomasa, a renowned general and castle engineer, hauled this large stone that was later named after him to the castle. But it is probable that this part of the castle's foundation was constructed by Kuroda Nagamasa. Feudal lords who were ordered to build the stone walls carved their marks on their stones to distinguish them from the stones of other lords.