Thawisan Ladawan

Thawisan Ladawan (ทวีสันต์ ลดาวัลย์; 26 January 1924 – 7 April 2006) was husband of Busba Kitiyakara (younger sister of Queen Sirikit), a member of King Bhumibol Adulyadej's Privy Council, and for 26 years, Principal Private Secretary to King Bhumibol Adulyadej.

Education
Thawisan attended Vajiravudh College and graduated from the inaugural class of Faculty of Law, Thammasat University in 1938.

Careers
After graduated, he worked in the Ministry of Foreign Affairs. He worked in several capitals, including Paris and Brussels, and earned a Diplome d'Etudes Superieures de Droit International Public from Paris University in 1954. He became Deputy Director-General of the Protocol Department before departing in 1968 to serve as Deputy Principal Private Secretary to King Bhumibol. A year later he became King Bhumibol's Principal Private Secretary, and was later appointed to the Privy Council.

Family
Thawisan was the son of Phra Phum Phichai (Mom Ratchawong Bung Ladawan) and Nueang Bunnag. His father was the ruler of Chaiyaphum Province, Lamphun Province, Mae Hong Son Province, and Kamphaeng Phet Province.

Thawisan married Busba Kitiyakara in 1958. They had a daughter, Suthawan Ladawan Sathirathai on 24 September 1958. He divorced her soon afterwards and never remarried. Suthawan married Surakiart Sathirathai.

Died
He died at the age of 82 due to chronic liver disease.

Thai honours

 * Order of Chula Chom Klao - 1st Class (Thailand) ribbon.svg Knight Grand Cross (First Class) of the Most Illustrious Order of Chula Chom Klao (1984)
 * Order of the White Elephant - Special Class (Thailand) ribbon.svg Knight Grand Cordon (Special Class) of the Most Exalted Order of the White Elephant (1978)
 * Order of the Crown of Thailand - Special Class (Thailand) ribbon.svg Knight Grand Cordon (Special Class) of the Most Noble Order of the Crown of Thailand (1975)
 * Chakrabarti Mala Medal (Thailand) ribbon.svg Chakrabarti Mala Medal (1974)
 * King Rama IX Royal Cypher Medal (Thailand) ribbon.svg Royal Cypher Medal of King Rama IX, 2nd Class (1971)
 * King Rama IX Rajaruchi Medal (Thailand) ribbon.svg Court Medal of King Rama IX (1960)

Foreign honour

 * West Germany: Grand Cross First Class of the Order of Merit of the Federal Republic of Germany (1984)