From 1925 to 1928, Setsuko was educated at the Sidwell Friends School in Washington, D.C. while her father was ambassador to the United States.[3] Setsuko was fluent in English and was sometimes considered to be a Kikokushijo. Upon her return to Japan, Setsuko was chosen by Empress Teimei to marry her second son, Yasuhito, Prince Chichibu, despite the fact she was a commoner.[4] Setsuko married the Prince after her uncle, Viscount Morio Matsudaira, formally adopted her, thus removing the status incongruity between the prince and his bride.[5]
On 28 September 1928, aged 19, Setsuko wed Prince Chichibu, and became Princess Chichibu.[6][7][8] The bride and groom were eighth cousins, thrice removed, as both were descended from Nabeshima Katsushige, the first lord of Saga.[9] Prince and Princess Chichibu had no children, as Princess Chichibu's only pregnancy ended in a miscarriage. However, by all accounts their marriage was filled with love and happiness for each other.[10][11]
After the Prince's death of tuberculosis in 1953,[15] Princess Chichibu became president of the Society for the Prevention of Tuberculosis, honorary president of the Britain-Japan Society, the Sweden-Japan Society, and an honorary vice president of the Japanese Red Cross[16] The Princess made several semi-official visits to Great Britain and Sweden.
Princess Chichibu died from heart failure in Tokyo on 25 August 1995, shortly before her 86th birthday.[17][18] Princess Chichibu's autobiography, which was published posthumously as The Silver Drum: A Japanese Imperial Memoir, was translated into English by Dorothy Britton.[19]
Sakata, Ikuko (March 1988). "Special Feature: Imperial Factions — Imperial Households of the Meiji, Taisho, and Showa Era — Princess Chichibunomiya Setsuko, a marriage of the Imperial Family -- a bride from the Aizu clan, or the Imperial Enemy" 特集 天皇家の閨閥--明治・大正・昭和の皇室 天皇家の結婚 秩父宮妃勢津子--朝敵「会津」の嫁入り. Rekishi Dokuhon. 33 (5 (472)). Kadokawa Publication: 102~109 (plate number 0053.jp2-).
Itō, Zensō (伊藤善創) (2018). Princess Chichibunomiya Setsuko, the Granddaughter to Matsudaira Katamori of the Aizu clan: Praying for the 90th Wedding Anniversary: 150th Anniversary of the Meiji Era 会津松平容保公御孫姫秩父宮妃勢津子さま: ご成婚九十周年を祈念して: 明治150年企画 (in Japanese). Fukushima Mimpō Newspaper (contibutor. 編集協力: 福島民報社). Fukushima: Mimpo Printing (民報印刷 制作・印刷). ISBN978-4-904834-37-4.
Matsudaira, Tsunekazu (松平恒忠). "Memories of Grandfather Matsudaira Tsuneo and Aunt Princess Chichibunomiya Setsuko" 祖父松平恒雄と叔母秩父宮妃勢津子の思い出. Rekishi to Tabi (歴史と旅). 24 (9 (368)): 128-133 (plate number 0067.jp2-).
Kampō 1928b, pp.741 (plate number 0002.jp2), "Announcement / Kunaishō / Number 29 / Marriage notice of Prince Yasuhito with the niece of Viscount Matsudaira Yasuo"
Kampō 1928b, pp.746 (plate number 0005.jp2), "Announcement/ Naimushō / Number 256 / Decorations and appointments (Shōkunkyoku) – as of 28 September Shōwa 3rd (1928); Princess Setsuko of Prince Chichibunomiya Yasuhito – Appointed to the Grand Cordon of the Order of the Precious Crown (1st class)."
Female staff writer (May 1929). "The Daily Life of Her Imperial Highness Princess Chichibunomiya Setsuko" 秩父宮妃勢津子殿下の御日常. Shufu No Tomo. 13 (5 (May issue)). Shufu no tomo-sha: 35-38 (plate number 0063.jp2-).
Chichibunomiya Setsuko (January 1949). "Amerika no gaku'en seikatsu wo shinonde" アメリカの学園生活を偲んで. New Age (ニューエイジ). 1 (1). Mainichi Newspaper: 26- (plate number 0015.jp2). doi:10.11501/2310430.
Chichibunomiya Setsuko (January 1951). "Congratulatory Remarks: National Health and the Mission of the Association" 祝辞 国民の健康と協会の任務. Journal of the Japanese Nursing Association. 3 (6): 5 (plate number 0006.jp2).
Murayama, Tomi'ichi (April 1998). Cabinet Secretariat (Japan) (ed.). "A tribute to the late Her Imperial Highness Princess Chichibunomiya Setsuko (25 August 1995)" 秩父宮妃勢津子殿下のご訃報に接しての謹話 (平成7・8・25). 村山内閣総理大臣演説集 (in Japanese). Nihon Kōhō Kyōkai (日本広報協会): 112.
Kirimo: Commemorating the Completion of the Relief of Her Imperial Highness Chichibunomiya Setsuko きりも: 秩父宮妃勢津子殿下御尊影レリーフ完成記念 (in Japanese). Ōtaki Village (Saitama Prefecture): Chichibunomiya Setsuko-hi Rerīfu kensetsu Īnkai. 2000.
岡本, 瓊二 (1928). "Dai-4 Chichibunomiya Yasuhito Shin'nō §3. Go-kon'yaku" 第四 秩父宮雍仁親王殿下 §三、御婚約. In Okamoto, Keiji (ed.). Kōshitsu to Gotairei 皇室と御大礼 (in Japanese). Tokyo: Monass. p.76 (plate number 0045.jp2). doi:10.11501/1874753. Available only at the NDL and its partner libraries or to official registered users in Japan.
Office of Imperial Household (Kunaishō) (1928-09-27). Ōkurashō Insatsu-kyoku (ed.). "Prince Yasuhito had wedding ceremony with Setsuko, the niece to Viscount Matsudaira Yasuo (Announcement #28, Kunaishō)" 告示 / 宮内省 / 第28号 / 雍仁親王殿下子爵松平保男姪勢津子ト結婚ノ禮ヲ行ハセラル. Kampo (官報). 1928-09-27. 日本マイクロ写真: 675. doi:10.11501/2956989– via NDL.
大蔵省印刷局 (1928-09-28). National Printing Bureau (ed.). "Announcements" 告示. Kanpō (官報 昭和3年) (in Japanese). 1928-09-29 (530): 741, 746 (plate numbers 0002.jp2, 0005.jp2). doi:10.11501/2956991– via NDL.
Kitokurō Hitotsugi (一木, 喜徳郎, Hitotsugi, Kitokurō, Kunaishō). "Announcement by Kunaishō #28 - Marriage notice of Prince Yasuhito with the niece of Viscount Matsudaira Yasuo. (宮内省 / 第29号 / 雍仁親王殿下本日正四位勲三等功五級子爵松平保男姪勢津子ト結婚セラル)". p. 741 (plate number 0002.jp2)
Naimushō (内務省). "Announcement by Naimushō #256 - Decorations and appointments (Shōkunkyoku) – as of 28 September Shōwa 3rd (1928); Princess Setsuko of Prince Chichibunomiya Yasuhito – Appointed to the Grand Cordon of the Order of the Precious Crown (1st class). " p.746 (plate number 0005.jp2)
Kase, Toshikazu (October 1995). "Her Imperial Highness Princess Chichibu's Jewel Box: a Goodwill Gift by the US Ambassador to Japan Mr. and Mrs. Glou at the break of WW2" 秩父宮妃殿下の宝石箱――開戦時、グルウ米駐日大使夫妻に贈られた善意. Sokoku to seinen (in Japanese). 26 (10 (205)). Nihon kyōgikai: 25-27 (plate numbers 0014.jp2-).
** Tanaka "In mourning for the death of Her Imperial Highness Princess Chichibunomiya Setsuko (秩父宮妃勢津子殿下の薨去を悼み奉りて, Chichibunomiya hi Setsuko denka no kōkyo wo itami tatematsurite)". pp.20-24 (plate number 0012.jp2-)
Prince Chichibu; Princess Setsuko (1948). Yanagisawa, Takeshi (ed.). Gotemba seiwa 御殿場清話. Figures series #1. Sekai no nihon-sha. NCIDBA35453355.
Chichibunomiya Setsuko (January 1973). "History of Showa period I shared with Prince (Interview) (宮さまと私の昭和史〔談話〕, Miyasama to watakushi no shōwashi 'Danwa')". Bungei shunjū. 51 (1): 220–231. NAID1521699229931106688.
Uyeno, Toshio (上野, 寿郎)Aizu no hiroku: Chichibunomiya Setsuko hidenka to Takajo (会津の秘録: 秩父宮勢津子妃殿下とたか女). Toshio Uyeno, 1987. NCIDBA5808818X.
Watanabe, Midori (渡辺, みどり). Haran no purinsesu: Chichibunomiya Setsuko hi no shōwashi (波瀾のプリンセス: 秩父宮勢津子妃の昭和史). Asahi Newspaper, 1995, "Asahi news shop series #031", NCIDBN13181934.
Princess Chichibu. The Silver Drum: A Japanese Imperial Memoir. Folkestone, Global Books Ltd.(distribution, UK) (May 1996). Trans. Dorothy Britton. ISBN1-86034-004-0
Prince and Princess Chichibu: two lives lived above and below the clouds. Rev. and expanded 2nd ed. Folkestone, Global Books Ltd.(distribution, UK) (2010). Trans. Britton, Dorothy. ISBN1905246242, 9781905246243. Including a complete translation of Setsuko, Princess Chichibu's memoir The silver drum.
Ema, Shuichi. Chichibu no Miya Hi Setsuko no shogai. Kaibushiki Kaisha Kuppon (1996). ISBN4-88975-601-9 (Japanese)
Lebra, Sugiyama Takie. Above the Clouds: Status Culture of the Modern Japanese Nobility. University of California Press (1995). ISBN0-520-07602-8
Fujitani, T. Splendid Monarchy: Power and Pageantry in Modern Japan. University of California Press; Reprint edition (1998). ISBN0-520-21371-8