Imperial Seal of Japan, the mon of the Japanese Imperial family, a 16 petal chysanthemum with a second set of petals visible behind.
Mon have their roots in Japan through the transmission of the Chinese culture of the T'ang Dynasty (618-907) to the Japanese court. Chinese emblems of the Sun and Moon, Blue Dragon, White Tiger and Three-legged Crow were symbols of the early Japanese sovereigns.
The rise of the samurai class and feudal society produced an increase in the use of heraldic devices. The Gempei War (1180-85) involved two factions, the Minamoto, who fought under banners of white, and the Taira, under red. The battles of the Gempei War were scattered and formalistic, fought by small, swift bands of warriors. The use of mon was rare at this time. The scale of warfare expanded following the Gempei War, and with the increase in the number of combatants came a rise in the use of mon. Dower concludes that the "predominant simplicity of the earliest warrior crests reflects the military concern which motivated their adoption; most were plain geometric forms and simple representational figures."The Hojo clan's three-triangle fish scale emblem [above] and the Ashikaga clan's geometric pattern [below] are representative of this period.
Around the end of the thirteenth century and the beginning of the fourteenth crests mon began to be associated with individual family units. The rise of kamon was accelerated by the adoption of a rule of primogeniture for the inheritance of an estate, which forced younger sons to form independent families of their own, often taking a new surname in the process. The Minamoto clan contained 4 subclans, 27 major branches and 569 different surnames by the end of the feudal period. Common clan emblems no longer served to delineate such numbers accurately. New variations on crests were created to represent newly independent families.
The crests of the three "great unifiers" of Japan, in descending order: Oda Nobunaga (1534-1582); Toyotomi Hideyoshi (1536-1598); and Tokugawa Ieyasu (1543-1616). Oda's crest is a China flower, a Chinese design not based on any specific flower, enclosed by a court pattern dating back to T'ang China. Toyotomi's crest is a paulownia flower pattern. The most popular design of all Japanese mon, the paulownia is considered an emblem of the imperial throne, and was bestowed upon Toyotomi by the imperial court. According to Chinese legend, the phoenix, bird of immortality, alights only in the branches of the paulownia when it returns to earth. The design is now a symbol of the Office of the Prime Minister of Japan. Tokugawa's crest is the hollyhock, a plant associated with a presitigious Kyoto shrine.
During the Tokugawa shogunate, the use of mon spread from the samurai and warrior classes to the peasant and merchant classes, and to the artisans, Kabuki actors and courtesans of the floating world of the Edo period. Crests became a common element of all classes. Hank Mukai tells me the Mukai kamon was selected primarily for its form. The crest is composed of a trifoliate clover-like wood sorrel leaf with three stylised sword blades inserted between each of the leaves and three blades penetrating from the leaf stem. The crest is similar to the above wood sorrel mon. The wood sorrel (katabami) produces many seeds and reproduces vigorously; this characteristic was seen as a token of future proliferation and prosperity. The wood sorrel is also known as the mirror plant (kagamigusa). It was used for polishing bronze mirrors, as well as forming a medicinal salve. The wood sorrel mon enjoyed much popularity among the samurai class.