The social hierarchy structure in feudal Japan was known as the "Shiki," which divided society into distinct classes. This hierarchy primarily consisted of four main groups: the samurai (warriors), farmers (peasants), artisans, and merchants, with samurai at the top due to their military role and loyalty to the ruling shogun. Within these classes, there was also significant emphasis on loyalty, honor, and duty, particularly among the samurai. The system upheld a strict social order that governed the relationships and roles of individuals within society, deeply influencing Japanese culture, governance, and social dynamics for centuries.