The is a Japanese

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

 sobriquet

Sobriquet

A sobriquet is a nickname, sometimes assumed, but often given by another. It is usually a familiar name, distinct from a pseudonym assumed as a disguise, but a nickname which is familiar enough such that it can be used in place of a real name without the need of explanation...

 describing four highly effective samurai

Samurai

is the term for the military nobility of pre-industrial Japan. According to translator William Scott Wilson: "In Chinese, the character 侍 was originally a verb meaning to wait upon or accompany a person in the upper ranks of society, and this is also true of the original term in Japanese, saburau...

 generals who fought on behalf of Tokugawa Ieyasu

Tokugawa Ieyasu

 was the founder and first shogun of the Tokugawa shogunate of Japan , which ruled from the Battle of Sekigahara  in 1600 until the Meiji Restoration in 1868. Ieyasu seized power in 1600, received appointment as shogun in 1603, abdicated from office in 1605, but...

 in Sengoku period

Sengoku period

The or Warring States period in Japanese history was a time of social upheaval, political intrigue, and nearly constant military conflict that lasted roughly from the middle of the 15th century to the beginning of the 17th century. The name "Sengoku" was adopted by Japanese historians in reference...

. They were famous during their lifetimes as the four most fiercely loyal vassals of the Tokugawa clan in the early Edo period

Edo period

The , or , is a division of Japanese history which was ruled by the shoguns of the Tokugawa family, running from 1603 to 1868. The political entity of this period was the Tokugawa shogunate....

.

Etymology

The sobriquet evolved from the "Four Heavenly Kings

Four Heavenly Kings

In the Buddhist faith, the Four Heavenly Kings are four gods, each of whom watches over one cardinal direction of the world.The Kings are collectively named as follows:...

" of Buddhist iconography. These are said to be the guardians of the four horizons.

Fudai leaders

Each of these four generals was the founder a cadet branch clan:

• Honda Tadakatsu
  Honda Tadakatsu
  , also called Honda Heihachirō , was a Japanese general of the late Sengoku through early Edo period, who served Tokugawa Ieyasu. Honda Tadakatsu was one of the Tokugawa Four Heavenly Kings along with Ii Naomasa, Sakakibara Yasumasa and Sakai Tadatsugu. - Biography :A native of Mikawa Province in...
  
    of the Honda clan
  Honda clan
  The ' is a Japanese family that claims descent from the medieval court noble Fujiwara no Kanemichi. The family settled in Mikawa and served the Matsudaira clan as retainers. Later, when the main Matsudaira family became the Tokugawa clan, the Honda rose in prestige. The clan includes thirteen...
  
  
• Ii Naomasa
  Ii Naomasa
  was a general under the Sengoku period Daimyo, and later Shogun, Tokugawa Ieyasu. He is regarded as one of the Four Guardians of the Tokugawa along with Honda Tadakatsu, Sakakibara Yasumasa and Sakai Tadatsugu.-Early life:...
  
   of the Ii clan
  Ii clan
  The ' is a Japanese clan which originates in Tōtōmi Province. It was a retainer clan of the Imagawa family, and then switched sides to the Matsudaira clan of Mikawa Province. A famed 16th century clan member, Ii Naomasa, served as one of Tokugawa Ieyasu's generals, and received the fief of Hikone...
  
  
• Sakakibara Yasumasa
  Sakakibara Yasumasa
  was a Japanese daimyo of the late Sengoku period through early Edo period, who served the Tokugawa clan. As one of the Tokugawa family's foremost military commanders, he was considered one of its "Four Guardian Kings"...
  
   of the Sakakibara clan
• Sakai Tadatsugu
  Sakai Tadatsugu
  was one of the most favored and most and successful military commanders serving Tokugawa Ieyasu in the late-Sengoku period. He is regarded as one of the Four Guardians of the Tokugawa .along with Honda Tadakatsu, Ii Naomasa, and Sakakibara Yasumasa.-Sakai clan genealogy:The Sakai clan originated in...
  
   of the Sakai clan
  Sakai clan
  The was a Japanese samurai clan that claimed descent from the Nitta branch of the Minamoto clan, who were in turn descendants of Emperor Seiwa. Serata Arichika, a samurai of the 14th century, was the common ancestor of both the Sakai clan and the Matsudaira clan, which the Sakai later served...
  
  

Further reading

• Bolitho, Harold
  Harold Bolitho
  Harold Bolitho was an Australian academic, historian, author and professor emeritus in the Department of East Asian Languages and Civilizations at Harvard University The name Bolitho is of Cornish origin.-Career:...
  
  . (1974). Treasures Among Men: The Fudai Daimyo in Tokugawa Japan. New Haven: Yale University Press. 10-ISBN 0-300-01655-7/13-ISBN 978-0-300-01655-0; OCLC 185685588