Masahito, Prince Hitachi

is a member of the Imperial House of Japan, the younger brother of Emperor emeritus Akihito and the paternal uncle of Emperor Naruhito. He is the second son and sixth born child of Emperor Shōwa and Empress Kōjun and is third and last in line to the Chrysanthemum Throne. He is mainly known for philanthropic activities and his research on the causes of cancer.

Early life and education

Born at Tokyo Imperial Palace in Tokyo, Masahito held the childhood appellation .

Masahito received his primary and secondary schooling at the Gakushūin Peers' School. In late 1944, the Imperial Household Ministry evacuated Prince Yoshi and the Crown Prince to Nikkō, to escape the American bombing of Tokyo.

After the war, from 1947 to 1950, Mrs. Elizabeth Gray Vining tutored both princes and their sisters, the Princesses Kazuko, Atsuko, and Takako, in the English language. Her account of the experience is entitled Windows for the Crown Prince (1952).

Prince Yoshi received his undergraduate degree in chemistry from the Faculty of Science at Gakushuin University in 1958. He subsequently did postgraduate work in the Faculty of Science at Tokyo University. In 1969, he became a Research Associate of the Japanese Foundation for Cancer Research specializing in the study of cellular division. The results of his research have been reported in the technical journals of the Japanese Cancer Association, as well as of the American Association for Cancer Research.

In 1997, Prince Hitachi received an honorary doctorate from George Washington University in the United States, and in April 2001 received another from the University of Minnesota. In March 1999, he became an honorary member of the German Association for Cancer Research, in recognition of his significant scientific contributions to the field of cancer research.

Marriage

On 30 September 1964, the Prince married Hanako Tsugaru (born 19 July 1940), fourth daughter of the late Yoshitaka Tsugaru, a former count and a descendant of the daimyō of Tsugaru Domain. The following day, Emperor Shōwa granted him the title Hitachi-no-miya (Prince Hitachi), and authorization to start a new branch of the Imperial Family in celebration of his wedding.

Prince and Princess Hitachi have their official residence in a palace in large gardens off Komazawadori in Higashi, Shibuya. They have no children.

In September 2021, the Japanese government considered plans to amend the Imperial Household Law and allow Prince Hitachi to adopt a male member of the former shinnōke or ōke collateral branches of the imperial family in an effort to address the Japanese imperial succession debate.

Public service Prince Hitachi is the honorary president of a wide variety of charitable organizations, especially those involving international exchange. Most recently, Prince and Princess Hitachi visited Nicaragua and El Salvador, to mark the 70th anniversary of the establishment of diplomatic relations with both countries in October 2005. They also made a visit to France in September 2007 and Peru, marking the celebration of 110 years since the establishment of a Japanese community in this country, June 2009.

Health Prince Hitachi suffered from fever in late February 2023 and was hospitalized on 1 March. He was diagnosed with ureteral stones for which he underwent ureteral stenting the day after at the Japanese Red Cross Medical Center. He was discharged from hospital on 5 March. On 21 March, he underwent ureteral lithotripsy and was discharged on 24 March. He was readmitted to hospital with a fever and loss of appetite on 2 April, and was subsequently diagnosed with a urinary tract infection. He was discharged from hospital on 24 April.

Titles and styles

28 November 1935 – 1 October 1964: His Imperial Highness Prince Yoshi 1 October 1964 – present: His Imperial Highness Prince Hitachi

Honours

National honours Grand Cordon of the Order of the Chrysanthemum (28 November 1955)

Foreign honours Knight of the Order of the Elephant (28 September 1965) Knight Grand Cross of the Order of Merit of the Italian Republic (22 November 1965) Member of the Order of the Benevolent Ruler (19 April 1960)

Honorary degree 1997: Doctor of Science, George Washington University 2001: Doctor of Science, University of Minnesota Chiang Mai University

Honorary positions President of the Japanese Society for the Preservation of Birds President of the Japanese Society for Disabled Children

Imperial House of Japan

Descent prior to Keitai is unclear to modern historians, but traditionally traced back patrilineally to Emperor Jimmu Emperor Keitai, ca. 450–534 Emperor Kinmei, 509–571 Emperor Bidatsu, 538–585 Prince Oshisaka, ca. 556–??? Emperor Jomei, 593–641 Emperor Tenji, 626–671 Prince Shiki???–716 Emperor Kōnin, 709–786 Emperor Kanmu, 737–806 Emperor Saga, 786–842 Emperor Ninmyō, 810–850 Emperor Kōkō, 830–867 Emperor Uda, 867–931 Emperor Daigo, 885–930 Emperor Murakami, 926–967 Emperor En'yū, 959–991 Emperor Ichijō, 980–1011 Emperor Go-Suzaku, 1009–1045 Emperor Go-Sanjō, 1034–1073 Emperor Shirakawa, 1053–1129 Emperor Horikawa, 1079–1107 Emperor Toba, 1103–1156 Emperor Go-Shirakawa, 1127–1192 Emperor Takakura, 1161–1181 Emperor Go-Toba, 1180–1239 Emperor Tsuchimikado, 1196–1231 Emperor Go-Saga, 1220–1272 Emperor Go-Fukakusa, 1243–1304 Emperor Fushimi, 1265–1317 Emperor Go-Fushimi, 1288–1336 Emperor Kōgon, 1313–1364 Emperor Sukō, 1334–1398 Prince Yoshihito Fushimi, 1351–1416 Prince Sadafusa Fushimi, 1372–1456 Emperor Go-Hanazono, 1419–1471 Emperor Go-Tsuchimikado, 1442–1500 Emperor Go-Kashiwabara, 1464–1526 Emperor Go-Nara, 1495–1557 Emperor Ōgimachi, 1517–1593 Prince Masahito, 1552–1586 Emperor Go-Yōzei, 1572–1617 Emperor Go-Mizunoo, 1596–1680 Emperor Reigen, 1654–1732 Emperor Higashiyama, 1675–1710 Prince Naohito Kanin, 1704–1753 Prince Sukehito Kanin, 1733–1794 Emperor Kōkaku, 1771–1840 Emperor Ninkō, 1800–1846 Emperor Kōmei, 1831–1867 Emperor Meiji, 1852–1912 Emperor Taishō, 1879–1926 Emperor Shōwa, 1901–1989 Masahito, Prince Hitachi