Background and career
Bajrakitiyabha, Princess Rajasarini Siribajra (7 December 1978 – 11 June 2026), also known as Princess Bha, was the eldest child of King Vajiralongkorn of Thailand and the only one born to his first wife Princess Soamsawali. Born during the reign of her grandfather, King Bhumibol Adulyadej, she was his and queen Sirikit's eldest grandchild.
A professional attorney, Bajrakitiyabha was known for her work that focused on incarcerated Thai women and their children, to ensure they are given adequate assistance to reenter Thai society upon release. Bajrakitiyabha was crucial in the United Nations implementation of the "Bangkok Rules", which became the first set of international guidelines addressing the treatment of women in the incarceration system. These efforts made her popular among the Thai public and cemented her as a potential heir to the throne. As a diplomat, she also served as an ambassador of Thailand to Austria, Slovakia, and Slovenia in the government of Yingluck Shinawatra.
On 14 December 2022, Bajrakitiyabha collapsed as a result of a heart condition while out walking her dogs. After a coma lasting three and a half years, she died on 11 June 2026 without regaining consciousness, following a series of complications. Her condition created uncertainty regarding the Thai line of succession as she was seen as a likely successor to her father.

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