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Inabayama Castle (later renamed Gifu Castle), used as headquarters by Dōsan

Saitō Dōsan (斎藤 道三 ?, 1494–May 28, 1556) was a daimyo who dramatically rose and also fell from power in Sengoku period Japan. He was also known as the Serpent of Mino (美濃の蝮 Mino no Mamushi ?) for his ruthless tactics.



Originally a wealthy merchant from Yamashiro Province (modern-day Kyoto Prefecture), he entered the service of Nagai Nagahiro of Mino Province (southern half of modern-day Gifu Prefecture), assuming the name Nishimura Kankurô.

He used his power and influence to become a retainer of the daimyo of Mino, Toki Yorinari.[1]

Dōsan contributed to general instability within Mino Province, so Yorinari gave him his concubine in the hopes that this would appease him in 1526.[2]

He later married Ômi no kata, a daughter of Akechi Suruga no kami Mitsutsugu.

He eventually succeeded in becoming the magistrate of Mino Province and settled in Inabayama Castle.[3] Using his power and wealth, he drove Toki Yorinari out of Mino Province in a coup d'état in 1542, and claimed the region as his own, becoming a daimyo in his own right. Afterwards, Toki Yorinari allied with Oda Nobuhide of Owari Province, which was on the southern border of Mino Province, but their defeat at the Battle of Kanōguchi, in 1547, solidified Dōsan's domination of Mino and also made him known throughout Japan. Oda Nobuhide made peace and arranged a political marriage in 1549, between his son, Oda Nobunaga, and Dōsan's daughter, Nōhime, to end all hostilities.


Ironically, Saitō Dōsan fell in his own son Saitō Yoshitatsu's coup d'état in 1556.

Around 1555, rumors began to circulate that Saitō Yoshitatsu was not in fact Dōsan's son; it was said that he was Yorinari's. It does not appear that Yoshitatsu had been aware of that possibility himself until he heard the rumors.

The circumstances surrounding this are unclear, however. One belief is that Dōsan, having had a number of sons after Yoshitatsu, had decided to name one of them heir (despite having officially retired by this point in favor of Yoshitatsu). Another theory holds that Yoshitatsu simply assumed that he would be disinherited, and decided to move first. A further idea is that Saitō Yoshitatsu just elected to usurp his father's power.

Relations at any rate quickly soured between Yoshitatsu and Dōsan, leading up to the Battle of Nagaragawa, where Dosan was heavily outnumbered.

In desperation, Toshimasa is alleged to have named Nobunaga as lord of Mino in his will and sent this document to Nobunaga. Nobunaga, however, was unable to provide help.

Dosan was defeated and his head was taken by a certain Komaki Genta, a retainer of Yoshitatsu's son Tatsuoki. His remains were originally interred in Sōfuku-ji, but they were later moved to Jōzai-ji because the Nagara River kept overflowing and covering his burial mound.[4] Both temples are located in Gifu.


Saitō Dōsan is known for having a large number of pseudonyms and for frequently changing his name. Some believe that this is because there were two Saitō Dōsan, father and son, and the son adopted his father's name after his death. Other names of Saitō Dōsan are Minemaru (峰丸), Hōrenbō (法蓮坊), Matsunami Shogorō (松浪庄五郎), Nishimura Kankurō Masatoshi (西村勘九郎正利), Shinkurō (新九郎), Nagai Norihide (長井規秀), and Saitō Sakondayu Toshimasa (斎藤左近大夫利政). The name Saitô was adopted from the former shugodai of Mino who had been overcome by the Nagai clan in the 1520s.


  1. ^ Sengoku Bushō Retsuden 12: Saitō Dōsan. Accessed September 20, 2007.
  2. ^ Saito Dosan - SamuraiWiki. The Samurai Archives. Accessed October 17, 2007.
  3. ^ Buke Kaden - Mino Saitō-shi. Harimaya. Accessed September 20, 2007.
  4. ^ Gifu City Walking Map. Gifu Lively City Public Corporation, 2007.


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