Sakai Tadatsugu (English Wikipedia)

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安藤優一郎 (2020). 日本の名将365日 (in Japanese). 辰巳出版株式会社. p. 134. ISBN 978-4777826193. Retrieved 25 May 2024.
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Harada Kazutoshi (2009, p. 153) Harada Kazutoshi (2009). Art of the Samurai Japanese Arms and Armor, 1156-1868. Metropolitan Museum of Art (New York, N.Y.). ISBN 9781588393456. Retrieved 6 May 2024.
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Mitsuhisa Takayanagi (1958). 戦国戦記本能寺の変・山崎の戦 (1958年) (in Japanese). 春秋社. p. 65. Retrieved 9 May 2024. Luís Fróis;History of Japan..; Nihon Yoso-kai Annual Report", Japanese historical materials also show that Ieyasu distributed a large amount of gold and silver to his subordinates) A certain " Ishikawa Tadashi Sosho
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Mikami Sanji (1922, p. 356) Mikami Sanji (1922). 寛政重修諸家譜』巻第六十五「酒井」 :国民図書版『寛政重修諸家譜第一輯』 (in Japanese). 國民圖書. p. 355. Retrieved 28 May 2024.

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Chido Museum: Sakai clan history Archived 2006-01-25 at the Wayback Machine

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Papinot, Jacques. (2003). Nobiliare du Japon -- Sakai, pp. 50-51; Papinot, Jacques Edmond Joseph. (1906). Dictionnaire d’histoire et de géographie du Japon. (in French/German).

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According to Imatani Akira, professor of Tsuru University, and Ishikawa Tadashi, assistant professor University of Central Florida, during Sengoku period there are emergence of particularly dangerous groups called "Ochimusha-gari" or "fallen warrior hunt" groups. these groups were decentralized peasant or Rōnin self-defense forces who operates outside the law, while in actuality they usually hunting Samurais or soldiers who has been defeated in wars.^[58]^[59]^[57]

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Hirai 1992, p. 52. Hirai, Takato (1992), 福山開祖・水野勝成 [Mizuno Katsunari the founder of Fukuyama], 新人物往来社 / Shin Jinbutsu Ōraisha, ISBN 4404019181, OCLC 28019953

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Aoyagi Akiko (2013). "歴史エッセイ ─庄内藩の女性たち─～序章酒井忠次公正室吉田殿" [Women of the Shonai Domain - Prologue, Tadatsugu Sakai's Office, Yoshida-dono]. 山形鶴翔同窓会. Retrieved 2022-11-11.