In what year was the last member of the Imperial House of Japan with a full beard before Prince Tomohito of Mikasa born?
1852
Emperor Meiji
Emperor Meiji (明治天皇 , Meiji-tennō , November 3, 1852 – July 30, 1912) , or Meiji the Great (明治大帝 , Meiji-taitei ) , was the 122nd Emperor of Japan according to the traditional order of succession, reigning from February 3, 1867 until his death on July 30, 1912.
 He presided over a time of rapid change in the Empire of Japan, as the nation quickly changed from an isolationist feudal state to a capitalist and imperial world power, characterized by the Japanese industrial revolution.
Prince Tomohito of Mikasa
Prince Tomohito of Mikasa (寛仁親王 , Tomohito Shinnō , 5 January 1946 – 6 June 2012) was a member of the Imperial House of Japan and the eldest son of Takahito, Prince Mikasa and Yuriko, Princess Mikasa.
 He was a first cousin of Emperor Akihito, and was formerly sixth in the line of succession to the Japanese throne and the heir apparent to the princely house of Mikasa-no-miya and the title "Prince Mikasa".
 Prince Tomohito was the first member of the Imperial House of Japan with a full beard since Emperor Meiji, thus earning him the popular nickname of the "Bearded Prince" (ヒゲの殿下 "Hige no Denka").
 He died of cancer on 6 June 2012, aged 66.
Yasuko Konoe
Yasuko Konoe (近衛甯子 , Konoe Yasuko , born 26 April 1944) , formerly Princess Yasuko of Mikasa (甯子内親王 , Yasuko Naishinnō ) , is the first child of Takahito, Prince Mikasa and Yuriko, Princess Mikasa.
 She married Tadateru Konoe on 16 December 1966.
 As a result, she gave up her imperial title and left the Japanese Imperial Family, as required by law. Yoshihito, Prince Katsura
Yoshihito, Prince Katsura (桂宮宜仁親王 , Katsura-no-miya Yoshihito Shinnō , 11 February 1948 – 8 June 2014) was a member of the Imperial House of Japan and the second son of Takahito, Prince Mikasa and Yuriko, Princess Mikasa.
 He was a first cousin of Emperor Akihito.
 Originally known as Prince Yoshihito of Mikasa, he received the title Prince Katsura (Katsura-no-miya) and authorization to start a new branch of the Imperial Family on 1 January 1988 at age 39.
 He died of a heart attack on 8 June 2014, aged 66. Yuriko, Princess Mikasa
Yuriko, Princess Mikasa (崇仁親王妃百合子 , Takahito Shinnōhi Yuriko ) , born Yuriko Takagi (高木百合子 , Takagi Yuriko ) on 4 June 1923, is a member of the Imperial House of Japan as the widow of Takahito, Prince Mikasa, the fourth son of Emperor Taishō and Empress Teimei.
 The Princess is the last surviving paternal aunt of the present emperor, Akihito, and currently is the oldest member of the Imperial Family, and the only living member who was born in the Taishō period during the reign of her father-in-law. Princess Yōko of Mikasa
Princess Yōko of Mikasa (瑶子女王 , Yōko Joō , born 25 October 1983) is a member of the Imperial House of Japan and the second daughter of Prince Tomohito of Mikasa and Princess Tomohito of Mikasa (Nobuko). Takahito, Prince Mikasa
Takahito, Prince Mikasa (三笠宮崇仁親王 , Mikasa-no-miya Takahito Shinnō , 2 December 1915 – 27 October 2016) was a member of the Imperial House of Japan.
 He was the fourth and youngest son of Emperor Taishō and Empress Teimei and was their last surviving child, the last surviving paternal uncle of Emperor Akihito.
 His eldest brother was Emperor Shōwa (Hirohito).
 After serving as a junior cavalry officer in the Japanese Imperial Army during World War II, the prince embarked upon a post-war career as a scholar and part-time lecturer in Middle Eastern studies and Semitic languages. Norihito, Prince Takamado
Norihito, Prince Takamado (高円宮憲仁親王 , Takamado-no-miya Norihito Shinnō , 29 December 1954 – 21 November 2002) was a member of the Imperial House of Japan and the third son of Takahito, Prince Mikasa and Yuriko, Princess Mikasa.
 He was a first cousin of Emperor Akihito, and was seventh in line to the Chrysanthemum Throne. Princess Akiko of Mikasa
Princess Akiko of Mikasa (彬子女王 , Akiko Joō , born 20 December 1981) is a member of the Imperial House of Japan and the elder daughter of Prince Tomohito of Mikasa and Princess Tomohito of Mikasa (Nobuko). Princess Tomohito of Mikasa
Princess Tomohito of Mikasa (寛仁親王妃信子 , Tomohito Shinnōhi Nobuko ) , born Nobuko Asō (麻生信子 , Asō Nobuko ) on 9 April 1955, is a member of the Japanese Imperial Family as the widow of Prince Tomohito of Mikasa.
 She is also known as Princess Nobuko.