War played a central part in the history of Japan. Warring clans controlled much of the country. A chief headed each clan; made up of related families. The chiefs were the ancestors of Japan's imperial family. The wars were usually about "land." Only 20% of the land was fit for farming. The struggle for control of that land eventually gave rise to the Samurai.
One of the important dates in the history of the Japanese warring class is 660 B.C. That's when, according to legend, Jimmu Tenno became head of a confederation of warlike clans. Tenno was known as "The Divine Warrior." He led his people from Kyushu to the Kinki region and conquered the people there. Tenno settled in the area of Yamato. This eventually gave rise to the Yamato dynasty and state. The leaders of Yamato believed themselves to be of divine origin.
Legend says that Emperor Keiko was the first person with the title of "Shogun." The word meant "Barbarian-subduing General." Legend continues that Keiko had a son named "Prince Yamato." He was cunning, fearless, strong and a great martial artist. Many believe that Yamato was a role model for future Samurai.
Ancient Yayoi warriors developed weapons, armour and a code during the ensuing centuries that became the centerpiece for the Japanese Samurai. Early weapons included bows, arrows and swords. Armour included a helmet that protected head and neck, a breasplate that protected the chest, arm and shoulder protectors, and a belly wrap. Later armour included protection for the legs and thighs. Armour changed as the type of battles changed. A big change occured in the 5th century when horses were introduced to Japan. Another change occured in the 15th century because of the constancy of war and the introduction of guns into battle. The code developed from the Chinese concept of the virtues of warriors doing battle to the Samurai code of chivalry known as Kyuba no michi ("The Way of Horse and Bow") to the Bushido ("Way of the Warrior") code.
"Bushido" means "Way of the Warrior." It was at the heart of the beliefs and conduct of the Samurai. The philosophy of Bushido is "freedom from fear." It meant that the Samurai transcended his fear of death. That gave him the peace and power to serve his master faithfully and loyally and die well if necessary. "Duty" is a primary philosophy of the Samurai.
The Samurai rose out of the continuing battles for land among three main clans: the Minamoto, the Fujiwara and the Taira. The Samurai eventually became a class unto themselves between the 9th and 12th centuries A.D. They were called by two names: Samurai (knights-retainers) and Bushi (warriors). Some of them were related to the ruling class. Others were hired men. They gave complete loyalty to their Daimyo (feudal landowners) and received land and position in return. Each Daimyo used his Samurai to protect his land and to expand his power and rights to more land.
A Samurai that became dispossed due to the death of his master would become a Ronin (man of the waves).