Sirindhorn

Maha Chakri Sirindhorn, The Princess Royal is a member of the Thai royal family. She is the second daughter of King Bhumibol Adulyadej and Queen Sirikit, and the younger sister of King Vajiralongkorn.

Early life

Birth

Sirindhorn was born on 2 April 1955, at Amphorn Sathan Residential Hall, Dusit Palace, the third child of King Bhumibol Adulyadej and Queen Sirikit. As the royal couple has only one son, the Thai constitution was altered in 1974 to allow for female succession. This made Princess Sirindhorn second-in-line to the throne until the birth of Princess Bajrakitiyabha in 1978.

Early education

Sirindhorn attended Kindergarten, Primary and Secondary at Thailand's most exclusive school: The Chitralada School which was established for the children of the Royal Family and Palace staff.
She ranked first in the National School Examinations in primary level in 1967, in upper secondary level in 1972, and fourth in the National University Entrance Examination in 1975.

Higher education

In 1975 she enrolled in the faculty of arts at Chulalongkorn University and graduated with a Bachelor of Arts, first-class honours and a gold medal in history in 1976.
From 1976 she continued her studies in two graduate programs concurrently, obtaining a Master of Arts in Oriental Epigraphy in 1980 and also archaeology from Silpakorn University in 1980. From October 1977, she studied Sanskrit in Bangkok for two years under the tutelage of renowned Sanskrit scholar Satya Vrat Shastri. In 1978, she obtained a Master of Arts in Pali and Sanskrit from Chulalongkorn University.
In 1981 she enrolled in a doctoral program at Srinakharinwirot University, and was awarded a PhD in developmental education in 1987.
In 1984 she earned a certificate from the Asian Regional Remote Sensing Training Centre at the Asian Institute of Technology where she studied for two months.
In April 2001 she won a scholarship in Chinese culture at Peking University in China where she studied the course for a month.

Later life

In December 2012, Sirindhorn was briefly hospitalised to remove calcium deposits.
More popular among the Thai public than her brother, then-Crown Prince Vajiralongkorn, Sirindhorn was long rumoured to be a potential successor to the Thai throne. Upon Bhumibol's death in 2016, the crown passed to Vajiralongkorn, now King Rama X. In 2019, she was bestowed the highest of royal ranks by appointment, Krom Somdej Phra, by King Vajiralongkorn. She also received a first-class King Rama X Royal Cypher Medal.
In January 2021, Sirindhorn was hospitalized after breaking both her ankles. Thai media reported that she fell during a walk; however, Western sources alleged that her ankles were broken by Vajiralongkorn after an argument.

Works and interests

Aside from her passion for technology, she holds degrees in history and a doctorate in educational development. She teaches at the history department of the Chulachomklao Royal Military Academy, where she is the nominal head of the department. In addition to Thai, she speaks fluent English, French and Mandarin Chinese, and is currently studying German and Latin. She translates Chinese literature into Thai.
She is also a skilled performer and avid promoter of Thai traditional music.
Like her father Bhumibol Adulyadej, Princess Sirindhorn holds a certificate as a radio amateur, with her call sign being HS1D.

Scholarship

The University of Liverpool introduced a scholarship in honour of Sirindhorn. One full scholarship will be awarded annually to enable a Thai student to study at Liverpool to complete a one-year taught Masters programme. The scholarship is open to all subjects in which a one-year taught Masters programme is offered; however, priority will be given to those students who wish to study in a subject area associated with Princess Sirindhorn such as science, information technology, medicine, the arts, geography, history and languages. To be eligible for the scholarship, applicants must be a Thai national and already hold an offer to study a one-year taught Masters programme at the University of Liverpool.

Honours and awards

Honorary degrees

; National

Chiang Mai University: Geography
Chiang Mai University: Thai language
Asian Institute of Technology: Technology

; Foreign

:
* – Lingnan University: Doctor of Letters
* – The University of Hong Kong: Doctor of Letters
* Peking University: Chinese language
– Tokai University: Engineering
– University of the Philippines Los Baños: Law
Singapore - National University of Singapore
:
* – Pomona College: Doctor of Humane Letters
* – Indiana University Bloomington: Doctor of Humane Letters
* – Northern Illinois University: Doctor of Humane Letters
* – Johns Hopkins University: Doctor of Humane Letters
* – Bay Path University: Doctor of Humane Letters

Honorary titles

: People’s Friendship Ambassador
: Special Ambassador of the World Food Programme for School Feeding
: ''UNESCO Goodwill Ambassador for "Empowerment of Minority Children through Education and through the Preservation of Their Intangible Cultural Heritage"''

Eponyms

Institutions

National

A number of academic and research institutions in Thailand are named after her:

, Mueang Nakhon Pathom, Nakhon Pathom Province.
Princess Maha Chakri Sirindhorn Anthropology Centre
Mahachakri Sirindhorn and Boromrajkumari Building, Faculty of Arts, Chulalongkorn University, Bangkok.
Somdech Phra Debaratana Medical Center, Ramathibodi Hospital, Bangkok.
Princess Maha Chakri Sirindhorn Music Library, Mahidol University, Bangkok
Sirindhorn International Institute of Technology, Thammasat University, Bangkok.
, King Mongkut's Institute of Technology North Bangkok.
Princess Maha Chakri Sirindhorn Natural History Museum, natural history museum, Faculty of Science, Prince of Songkla University, Hat Yai Campus, Hat Yai, Songkhla Province.
, Chiang Mai University, Doi Suthep, Chiang Mai Province.
, a Galactic cosmic ray detector at Thailand's highest mountain, Doi Inthanon, Chiang Mai Province.
, Srinakharinwirot University, Onkarak Campus, Nakhon Nayok Province
Sirindhorn Chinese Language and Culture Center at Mae Fah Luang University, which was a gift from China and named in honor of Sirindhorn's role in Thailand-China cultural exchange.

Foreign

Sirindhorn Technology and Culture Exchange Center, Peking University, Haidian District, Beijing, China.
, Mianyang, Sichuan, China.

Places

Sirindhorn MRT station of the Bangkok MRT Blue Line
Amphoe Sirindhorn of Ubon Ratchathani Province
Sirindhorn Dam stops the Dom Noi River in Sirindhorn, Ubon Ratchathani Province.
, Phu Kum Khao Dinosaur Research Center, Sahatsakhan, Kalasin Province.
Sirindhorn Observatory, Department of Physics, Faculty of Science, Chiang Mai University
Princess Sirindhorn Stadium, is a sports stadium in Si Racha, Chonburi Province.
Princess Sirindhorn Wildlife Sanctuary, the largest protected peat swamp forest in Thailand is located in Narathiwat Province.

Fauna

Several fauna species are named after her, including:Eurochelidon sirintarae, a critically endangered swallow first described in 1968.Phricotelphusa sirindhorn. It was described in Crustaceana in 1989.Phuwiangosaurus sirindhornae, a sauropod herbivore dinosaur from the Early Cretaceous period. It was described in 1994.Sirindhorna khoratensis, a hadrosauroid dinosaur from the Early Cretaceous. It was described in 2015.Acanthosquilla sirindhorn. It was described in Crustaceana in 1995.Tarsius sirindhornae, an ancient primate.Streptocephalus sirindhornae, a freshwater fairy shrimp. It was described in the Journal of Crustacean Biology in 2000.Macrobrachium sirindhorn, a freshwater prawn. It was described in Crustaceana in 2001.Trigona sirindhornae, a bee.Sirindhorn thailandiensis.Loxosomatoides sirindhornae, a freshwater kamptozoan. It was described in Hydrobiologia in 2005.Aenictus shilintongae Jaitrong & Schultz, 2016, an ant.Camponotus sirindhornae Jaitrong, Jantarit & Pitaktunsakul, 2025, an ant.Tetraponera sirindhornae Yodprasit, Tasen & Jaitrong, 2025, an ant.Oligoaeschna sirindhornae Ngiam & Orr, 2017Chironephthya sirindhornae Imahara, Chavanich, Viyakarn, Kushida, Reimer & Fujita, 2020

Flora

Numerous plant species have been named after her:Sirindhornia spp., orchids:

* Sirindhornia pulchella can only be seen in Doi Chiang Dao National Park, blooming from April to June.
* Sirindhornia mirabilis can only be seen in Doi Hua Mot in Tak Province, blooming during May and June.
* Sirindhornia monophyla can be seen in Doi Hua Mot in Tak Province from March to June, as well in Myanmar and China.
Other plant species include:
* Bauhinia sirindhorniae, a vine of the pea family. It was described in the Nordic Journal of Botany in 1997.
* Magnolia sirindhorniae
* Thepparatia scandens Phuph. or Khruea thepparat malvaceae. Thepparat is a part of her royal title. It was described in the Thai Forest Bulletin in 2006.
* Impatiens sirindhorniae Triboun & Suksathan, 2009. It was described in Gardens' Bulletin Singapore.
*Chayamaritia sirindhorniana D. J. Middleton, Tetsana & Suddee. The species is endemic to Loei Province.