Question: Prince Hisahito of Akishino's father was born in what year?

Context articles: Princess Mako of Akishino
Princess Kako of Akishino
Kiko, Princess Akishino
Crown Prince Sado
Emperor Jianwen of Liang
Fumihito, Prince Akishino
Prince Hisahito of Akishino
Bader bin Saud bin Mohammed Al Saud
Brazilian imperial family
Tufa Rutan

Princess Mako of Akishino (眞子内親王 , Mako Naishinnō , born 23 October 1991) is the first child and oldest daughter of Fumihito, Prince Akishino and Kiko, Princess Akishino, and a member of the Japanese Imperial Family.
 She is the eldest grandchild of Emperor Akihito and Empress Michiko.
Princess Kako of Akishino (佳子内親王 , Kako Naishinnō , born 29 December 1994) is the second daughter of Fumihito, Prince Akishino and Kiko, Princess Akishino, and a member of the Japanese Imperial Family.
 She is the second-eldest grandchild of Emperor Akihito and Empress Michiko.
Kiko, Princess Akishino (文仁親王妃紀子 , Fumihito Shinnōhi Kiko ) , born 11 September 1966 as Kiko Kawashima (川嶋紀子 , "Kawashima Kiko" ) , is the wife of Fumihito, Prince Akishino, the second son of Emperor Akihito and Empress Michiko of Japan.
 She is also known as Princess Kiko.
Crown Prince Sado (13 February 1735 – 12 July 1762) was born Prince Jangheon, the second son of the Korean king Yeongjo (1694 – 1776).
 Due to the prior death of his older brother Prince Hyojang (1728), the new prince was the probable royal heir.
 However Prince Sado was not given an opportunity to reign.
 At the age of 27, he was executed by order of his father, and died of starvation by being confined in a rice chest.
 His father gave him the posthumous title Sado, meaning "Thinking of with great sorrow."
Emperor Jianwen of Liang (梁簡文帝) (2 December 503 – 551), personal name Xiao Gang (蕭綱), courtesy name Shizuan (世纘), nickname Liutong (六通), was an emperor of the Chinese Liang Dynasty.
 He was initially not the crown prince of his father Emperor Wu, the founder of the dynasty, but became the crown prince in 531 after his older brother Xiao Tong died.
 In 549, the rebellious general Hou Jing captured the capital Jiankang, and Hou subsequently held both Emperor Wu and Crown Prince Gang under his power, having Crown Prince Gang take the throne (as Emperor Jianwen) after Emperor Wu's death later that year.
 During Emperor Jianwen's reign, he was almost completely under Hou's control, and in 551, Hou, planning to take the throne himself, first forced Emperor Jianwen to yield the throne to his grandnephew Xiao Dong the Prince of Yuzhang, and then sent messengers to suffocate the former emperor.
Fumihito, Prince Akishino (秋篠宮文仁親王 , Akishino-no-miya Fumihito Shinnō , born 30 November 1965) is a member of the Japanese imperial family.
 He is the younger son of Emperor Akihito and Empress Michiko and currently second in line to the Chrysanthemum Throne.
Prince Hisahito of Akishino (悠仁親王 , Hisahito Shinnō , born 6 September 2006) is the youngest child and only son of Fumihito, Prince Akishino and Kiko, Princess Akishino.
 He is the only grandson of Emperor Akihito and Empress Michiko.
 Hisahito is third in line to become Emperor of Japan, after his uncle Naruhito and his father.
Prince Bader bin Saud bin Mohammed bin Abdulaziz bin Saud bin Faisal bin Turki Al Saud (born 27 November 1969), is a Saudi Public Affairs Writer under the nom de plume Bader bin Saud, Paratrooper Colonel at the Saudi Arabian Ministry of Interior, and previously president of the Saudi Students Clubs in the UK & Ireland.
 He is now the Deputy Commander of the Public Security Training City in Al Madinah Region, Kingdom of Saudi Arabia.
 His father is Prince Saud bin Mohammed Al Saud, and his mother Princess Alanoud bint Abdullah bin Abdulmohsen Alfirm.
 Two of his siblings are known poets, Prince and Dr Saad Al Saud, known as “Munadi,” (the caller).
 The other is Prince Abdulaziz bin Saud Al Saud, known as “Alsamir”, (the one who stays up all night) Prince Bader has six children - Prince Faisal, Prince Saud, Prince Khalid, Prince Fahad, Princess Reem and Princess Aljohara.
The Brazilian Imperial Family is a royal family and cadet branch of the Portuguese Royal House of Braganza that ruled the Empire of Brazil for 67 years, between 1822 and 1889, after the proclamation of independence by Prince Pedro of Braganza who was later acclaimed as Pedro I, "Constitutional Emperor and Perpetual Defender of Brazil".
 The members of the family are dynastic descendants of Emperor Pedro I. Claimants to headship of the post-monarchic Brazilian Imperial legacy descend from Emperor Pedro II, including the senior agnates of two branches of the House of Orléans-Braganza; the so-called "Petrópolis" and "Vassouras" lines.
 Prince Pedro Carlos of Orléans-Braganza (born 1945) heads the "Petrópolis" line, while the "Vassouras" branch is led by his second cousin, Prince Luiz of Orléans-Braganza.
 Rivalry within the family erupted in 1946 when "Dom" Pedro Gastão (1913–2007) repudiated the renunciation to the throne of his late father, Pedro de Alcântara, Prince of Grão-Pará (1875–1940), for himself and his future descendants, when he made a non-dynastic marriage in 1908.
 Pedro de Alcântara was the eldest son of the Princess Imperial Isabel (1846–1921) who, as Pedro II's elder daughter and heir presumptive when he was dethroned, became the last undisputed head of the family after her father's death in exile in 1891.
 Pedro Carlos is "Dom" Pedro Gastão's eldest son.
 "Dom" Luiz descends from Isabel's younger son, Prince Luís (1878–1920) who, by a Bourbon princess, fathered Prince Pedro Henrique (1909–1981).
 Dom Luiz is Pedro Henrique's son by a Bavarian princess and upholds his dynastic claim to the same legacy.
Tufa Rutan (; 365–415), formally Prince Jing of (Southern) Liang) ((南)涼景王), was the last prince of the Xianbei state Southern Liang.
 As he was the son that his father, the Xianbei chief Tufa Sifujian (禿髮思復犍), considered most talented, his older brothers, the founding prince Tufa Wugu (Prince Wu) and Tufa Lilugu (Prince Kang) both decided to pass the throne to a brother, intending that he receive the throne.
 However, Tufa Rutan, while obviously talented as a general, is viewed by historians as being overly aggressive in waging military campaigns, and he greatly drained the resources of the Southern Liang people while doing so.
 Southern Liang's strength particularly waned after a major 407 defeat at the hand of the Xia emperor Liu Bobo, and it drew attacks from its neighbors Northern Liang and Western Qin.
 Eventually, Tufa Rutan was forced to surrender to Western Qin in 414 after Western Qin captured his capital Ledu (樂都, in modern Haidong Prefecture, Qinghai), and he was poisoned to death a year later.