Kato Kiyomasa, Fukushima Masanori, and Maeda Toshimitsu were some of the 20 feudal lords from the northern and western part of Japan who were appointed to the construction. The inscription of feudal lords and their vassals carved on the stones they carried are still visible today on the stone walls. Up until the Meiji Restoration, Nagoya Castle flourished as the castle where the Tokugawa lineage of Owari, the foremost of the three Tokugawa family lineages, resided. — from the entrance billboard of Nagoya Castle

On the stone walls of Nagoya Castle, you can see interesting marks, such as figures of triangles in circles, and the rough outlines of folding fans, war fans, and other objects. These are called ‘kokumon’ or carved crests, and represent the different daimyo lords and their vassals who were apportioned sections in the construction of Nagoya Castle. They were carved onto the stones so that there would be no mistake as to which lord contributed which of the difficult-to-transport stones, and avoid disputes. — from a billboard at the entrance of the main gate