|Prince of Siam , Prince of Chainat|
HRH Prince Rangsit Prayurasakdi, Prince of Chainat
|Full name||HRH Prince Rangsit Prayurasakdi, Prince of Chainat|
|Titles||Prince of Chainat|
|Born||November 12, 1885|
|Died||March 7, 1951|
|Place of death||Bangkok, Thailand|
|Wife||Mom Elisabeth Rangsit na Ayudhaya (née Scharnberger)|
|Issue||3 sons and daughters|
|Royal House||House of Chakri|
|Mother||Chao Chom Manda (Range of Royal Consort) Nueng|
Rangsit Prayurasakdi, Prince of Chainat (Thai: สมเด็จพระเจ้าบรมวงศ์เธอ พระองค์เจ้ารังสิตประยูรศักดิ์ กรมพระยาชัยนาทนเรนทร; RTGS: Somdet Phra Chao Borommawong Thoe Pra Ong Chao Rangsitprayurasak Krom Phraya Chainatnarenthon; 12 November 1885 - 7 March 1951) was the Thai Founder of the Public Health Ministry and Prince Regent.
Prince Rangsit was born as the 52nd child of King Chulalongkorn and the second child of Chao Chom Manda Nueng (common name Mom Rajawongse Nueng Snidvongs), the 22nd wife of Chulalongkorn. After the early death of his mother, Prince Rangsit and his elder sister Princess Yaovabha Bhonghsanids were adopted by Queen Savang Vadhana. As a result, he grew up as a half-brother and childhood friend of Prince Mahidol. He started his education at the Royal School in the Grand Palace. At the age of 14, he was sent to Germany for his education. At first the Martineum gymnasium in Halberstadt where he graduated with Abitur in 1905 and later Heidelberg-University in Heidelberg. Though he was more interested in medicine, his father insisted on an education in jurisdiction, which he completed at the Ruprecht Karl University of Heidelberg. He additionally studied philosophy in 1908. It was during his study that he met his wife, Elisabeth Scharnberger (15 September 1892 - 29 September 1973), a German woman whom he married in London on 28 August 1912. The couple had two sons and one daughter:
- HSH Prince Piyarangsit Rangsit (25 December 1913 - 1 February 1990)
- HSH Prince Sanidh Prayurasakdi Rangsit (19 August 1917 - 10 September 1995)
- HSH Princess Charulaksana Kalyani Rangsit (born 7 August 1924). She relinquished her royal title to marry a commoner on 28 June 1945.
Life in Siam
After returning to Siam in 1913, during the reign of his elder brother King Vajiravudh, Prince Rangsit worked to improve Siam’s health care system. Today, a statue of Prince Rangsit stands in front of Thailand’s Ministry of Public Health, of which he is the founding father. He also worked to improve the nation's university system, serving as the first Director-General of the University Affairs Department, and the Chairman of the Committee on Planning and Development of Chulalongkorn University.
Following the Siamese Revolution of 1932, Prince Rangsit did not involve himself in politics, but was nevertheless seen as a threat by the Pro-Fascist military government of Major General Phibunsongkhram, which arrested the Prince under charges of treason in 1938. This was possibly due to his position as the most senior prince remaining in the country at the time. In prison he spent much of his time in meditation and in the writing of a journal which recounts his childhood memories and experiences of traveling to Europe for the first time in 1899. On 28 September 1943, having been jailed for 4 years and 9 months, Prince Rangsit was released by the Phibun-government (1 year prior to the release of other political prisoners). Along with the release of Phibun's other political prisoners, Prince Rangsit's titles were permanently restored to him by the Khuang-Pridi government which came to power following Phibun's forced resignation in May 1944.
Prince Rangsit is reputed to have had a significant role in ensuring the continuity of the Thai royal family in its transitory phase from the uncertainties which followed the abdication of (his younger half-brother) King Rama VII to the Coronation of his two nephews King Ananda Mahidol and King Bhumibol Adulyadej. After King Ananda Mahidols mysterious death in the Grand Palace, Prince Bhumipol, the second child of Rangsit's half-brother Prince Mahidol, was appointed as the new king. Since the new king at first planned to finish his education abroad, Prince Rangsit was appointed as Regent on June 16, 1946, as well as chairman of the Supreme Council of State since 1947.
In March 1951, Prince Rangsit died of a heart attack while in bed at Vidyu Palace on Wireless Road in Bangkok. At his death, he was the last surviving son of King Chulalongkorn, having lived 65 years and four months. He was also known to be a great collector of Thai antiques and art works.
The Rangsit canal and the outskirts of Bangkok known as Rangsit were named in honour of this prince during his lifetime, although the highway in Bangkok known as Vibhavadi Rangsit is named after his daughter in law, HRH Princess Vibhavadi Rangsit.
HRH, Prince Rangsit Prayursak:First-Trip Abroad-1899 (2005), edited by M.R.Priyananda Rangsit, Bangkok (ISBN, 974-932231-2) Royal Family of Thailand 
- About Chulalongkorn University: Prince Rangsit of Chainad. Retrieved December 24, 2008.
Background to the Faculty of Arts, Chulalongkorn University 
Brief history of pharmacy education in Thailand, Faculty of Pharmacy, Mahidol University 
Faculty of Arts, Chulalongkorn University 
Distinguished contributors to the evolution of Chulalongkorn University 
Prince Rangsit of Chainad 
The coronation of the longest reigning monarch 
Postage stamps of historic Thai personalities