Bhumibol Adulyadej (Rama IX, royal name Phra Chaoyuhao Bhumibol Adulyadej) the Great, is King of Thailand since 1946. He is the world's longest-serving Head of State, and is the 9th king of the Thai Chakri Dynasty.
After his older brother Ananda Mahidol died, he succeeded him, on June 9, 1946 as the new king. However, he first finished his education, with a major in Law and Political Science, before being officially crowned, on May 5, 1950. A few days before, on April 28, he married Mom Rajawongse Sirikit Kitiyakara. They have four children, viz:
- (Formerly HRH) Princess Ubol Ratana, born April 5, 1951;
- HRH Crown Prince Maha Vajiralongkorn, born July 28, 1952;
- HRH Princess Maha Chakri Sirindhorn, born April 2, 1955;
- HRH Princess Chulabhorn, born July 4, 1957.