CS1 Thai-language sources (th)

Yoshihito (Japanese: 嘉仁, 31 August 1879 – 25 December 1926), posthumously honored as Emperor Taishō (大正天皇, Taishō-tennō), was the 123rd emperor of Japan, according to the traditional order of succession, reigning from 1912 until his death in 1926. The era he presided over is known as the Taishō era.
Born to Emperor Meiji and his concubine Yanagiwara Naruko, Yoshihito was proclaimed crown prince in 1888, his two older siblings having died in infancy. In 1900, he married Kujō Sadako, a member of the Kujō family of the Fujiwara clan. The couple had four children: Hirohito, Yasuhito, Nobuhito and Takahito. Upon the death of his father in 1912, Yoshihito ascended the Chrysanthemum Throne. Suffering from neurological issues for the better part of his life, he played only a limited role in politics and from 1919 on undertook no official duties. His reign was characterized by a liberal and democratic shift in political power known as Taishō Democracy. It also saw Japan's entrance in the First World War and the Great Kantō earthquake of 1923.
Yoshihito's declining health led to the appointment of Crown Prince Hirohito as prince regent in 1921. He spent the rest of his life as a recluse. In 1926, Yoshihito died of a heart attack at the age of 47 following a bout of pneumonia. He was succeeded by his eldest son, Hirohito, as Emperor of Japan.

Willem-Alexander (Dutch: [ˈʋɪləm aːlɛkˈsɑndər]; Willem-Alexander Claus George Ferdinand; born 27 April 1967) is King of the Netherlands.
Willem-Alexander was born in Utrecht during the reign of his maternal grandmother, Queen Juliana, as the eldest child of Princess Beatrix and Prince Claus. He became Prince of Orange as heir apparent upon his mother's accession on 30 April 1980. He went to public primary and secondary schools in the Netherlands, an international sixth-form college in Wales, served in the Royal Netherlands Navy, and studied history at Leiden University. He married Máxima Zorreguieta Cerruti in 2002, and they have three daughters: Catharina-Amalia, Alexia, and Ariane. Willem-Alexander succeeded his mother as monarch upon her abdication in 2013.
Willem-Alexander is interested in sports and international water management issues. Until his accession to the throne, he was a member of the International Olympic Committee (1998–2013), chairman of the Advisory Committee on Water to the Dutch Minister of Infrastructure and the Environment (2004–2013), and chairman of the Secretary-General of the United Nations' Advisory Board on Water and Sanitation (2006–2013).

Carl XVI Gustaf (Carl Gustaf Folke Hubertus; born 30 April 1946) is King of Sweden.
Carl Gustaf was born during the reign of his great-grandfather, King Gustaf V. He is the youngest child and only son of Prince Gustaf Adolf, Duke of Västerbotten, and Princess Sibylla of Saxe-Coburg and Gotha. His father died in January 1947 in an airplane crash in Denmark when Carl Gustaf was nine months old. Carl Gustaf became crown prince and heir apparent to the Swedish throne at the age of four when his grandfather, King Gustaf VI Adolf, ascended the throne in 1950.
Carl Gustaf ascended the throne upon his grandfather's death on 15 September 1973. Shortly after he became king, the new 1974 Instrument of Government took effect, formally stripping Carl Gustaf of his remaining executive power. As a result, he no longer performs many of the duties normally accorded to a head of state, such as the formal appointment of the prime minister, signing off on legislation, and being commander-in-chief of the nation's military. The new instrument explicitly limited the king to ceremonial functions and, among other things, to be regularly informed of affairs of state. As head of the House of Bernadotte, Carl Gustaf has also been able to make a number of decisions about the titles and positions of its members.
In June 1976, Carl Gustaf married Silvia Sommerlath. They have three children: Victoria, Carl Philip, and Madeleine. The King's heir apparent, after passage on 1 January 1980 of a new law establishing absolute primogeniture, is his eldest child, Crown Princess Victoria. Before the passage of that law, Victoria's younger brother, Carl Philip, was briefly the heir apparent, as of his birth in May 1979. Carl XVI Gustaf is the longest-reigning monarch in Swedish history, having surpassed King Magnus IV's reign of 44 years and 222 days on 26 April 2018.