Vibhavadi Rangsit

Princess Vibavadi often visited soldiers and Border Patrol Police stationed in areas where there was communist insurgency. On the morning of 16 February 1977, she set off on what should have been a routine visit to villages and to boost the morale of troops at Wiang Sa District, Surat Thani. While flying to her destination in an army helicopter, she heard a radio message saying two Border Patrol Policemen had been wounded by a landmine. She immediately ordered the flight diverted to pick up the wounded men and rush them to a hospital. As they flew at low altitude over Ban Nua Khlong, the helicopter was attacked from the ground by communist insurgents. A burst of heavy machine gun fire crippled the helicopter and seriously wounded the princess. She died one hour later.

Prior to her royally sponsored cremation at Ratchabophit Temple, on 4 April 1977, "in recognition of her services to the country and the people", the king elevated her to the higher royal rank of Phra Chao Worawongse Ther Phra Ong Chao (Her Royal Highness) and awarded her the highest level of the most Illustrious Order of the House of Chakri.

The last ten years of her life were dedicated to rural development in southern Thailand under the direction and sponsorship of the king. Her involvement began when the monarch asked her to go to a remote area called Phrasaeng in Surat Thani Province. From that initial visit in 1967, she was committed to the development of neglected areas and the improvement of the villagers' living standards. Sponsored by the king, she led a medical team on many missions to distribute medical supplies, schooling equipment, blankets, and other necessities to villagers in remote and almost inaccessible parts of the South.

In addition to a full writing career, the princess worked for her third cousin, King Bhumibol Adulyadej and his consort, Queen Sirikit of Thailand. In 1957, she began accompanying them when they toured the country and was appointed a lady-in-waiting to the queen when they went on their first state visit abroad in 1960. Princess Vibhavadi accompanied them on seven occasions, visiting twenty-five countries.

Princess Vibhavadi Rangsit married Prince Piyarangsit Rangsit (ปิยะรังสิต รังสิต), eldest son of Rangsit Prayurasakdi, Prince of Chainat and Elisabeth Scharnberger, on 6 May 1946. They were the only couple married by King Ananda Mahidol (Rama VIII). She had two daughters:

Princess Vibhavadi Rangsit (Thai: วิภาวดีรังสิต; RTGS: Wiphawadi Rangsit; 20 November 1920 – 16 February 1977), née Princess Vibhavadi Rajani (Thai: วิภาวดี รัชนี; RTGS: Wiphawadi Ratchani) was a Thai writer and a member of the Thai royal family well known for her fiction writing and her developmental work in rural Thailand.

Princess Vibhavadi Rangsit was born on 20 November 1920. She was the eldest daughter of Rajani Chamcharas, Prince Bidyalongkorn and Princess Phonphimonphan Rajani (née Princess Phimonphan Voravan). She had a sibling, Prince Bhisadej Rajani.