About Ubol Ratana
Ubol Ratana (born 5 April 1951) is a member of the Thai royal family. She is the eldest child of King Bhumibol Adulyadej (Rama IX) and Queen Sirikit, and the elder sister of King Vajiralongkorn (Rama X). In 1972, she married American citizen Peter Ladd Jensen and settled in the United States, after giving up her royal title. The couple divorced in 1998, whereupon she resumed her royal duties and position within the Thai court. She is styled in English as Princess Ubol Ratana, without the style Her Royal Highness. In 2001, she permanently returned to Thailand after a series of visits in the years following her divorce. Almost immediately, she began to fulfill her royal duties by taking part in many ceremonies. She started many charitable foundations that focused on improving the quality of life for the disadvantaged. In February 2019, in an "unprecedented" move, Ubol Ratana announced her candidacy for Prime Minister of Thailand in the 2019 general election, running as a candidate of the Thai Raksa Chart Party. Later that same day, her younger brother King Vajiralongkorn issued a statement, stating that her candidacy is "inappropriate" and "unconstitutional". Thailand's election commission then disqualified her from running for prime minister, formally putting an end to her candidacy. In the 1967 Southeast Asian Peninsular Games (today called the "Southeast Asian Games") held in Bangkok, the Ling and the princess competed in the OK Dinghy sailing class and won gold medals for Thailand. Their participation was conceived by Air Chief Marshal Dawee Chullasapya, who wanted King Bhumibol to be seen excelling in sports, much like King Olav V of Norway, who won an Olympic gold medal. Dawee feared that this would tarnish the King's prestige, but the King ultimately won the race, and the father and daughter shared the medal. The palace discovered this, and her parents strongly opposed their relationship.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.