Prince Bhisadej Rajani (Thai: ภีศเดช รัชนี; RTGS: Phisadet Ratchani; complete title: His Serene Highness Prince (Mom Chao) Bhisadej Rajani; 20 January 1922 – 23 July 2022) was a prince of Thailand, a member of the Thai royal family, and a member of the House of Rajani, a royal house which was originated by his father and descends from Chakri Dynasty. He was one of the longest-living royal personages in the Thai history. He was a close friend of the late King Bhumibol Adulyadej, who was also his third-degree cousin (since they both shared a common great-great-grandfather, King Rama II and their great-grandfathers, King Mongkut and Prince Pinklao were brothers, henceforth, King Chulalongkorn and Prince Wichaichan, their respective grandfathers were related as first cousins, which in turn beg