The longest reigning kings in the world

The King of Thailand has been ruling the country for 70 years, followed by five heads of the world's longest-standing royal families according to AFP.

1. , born on April 21, 1926, inherited the throne on February 6, 1952 after the death of his father King George VI.In the picture, the Queen of England walks with the Thai king who has just bore Bhumibol Adulyadej in Bangkok in 1972. (photo: AP).

Celebration of the 90th birthday of Queen Elizabeth II on June 11, 2016.(photo: Getty).

2. Brunei Sultan Hassanal Bolkiah , 70, took the throne in October 1967 after his father abdicated.In the picture, the King is celebrating at his son's wedding.(photo: Reuters).

Brunei Sultan Hassanal Bolkiah (left) and former Indonesian President Susilo Bambang Yudhoyono wear uniforms for Indonesian Air Force surveillance in 2008. (photo: Pinterest)

3. Sultan Oman Qaboos , 75, was crowned July 23, 1970, worshiped as a military patron of the country.In the photo, Sultan Oman received a gift from the Queen of England during her visit to Oman in 2010. (photo: Getty).

Sultan Qaboos Sultan during the military parade on the same year he was promoted to 1970. (photo: AFP).

4. Queen Margrethe II of Denmark, 76 years old, was crowned in 1972. Her photo in an event prepared for Prince Frederik's wedding.(photo: Getty).

Queen Margrethe II in Bat Trang, Vietnam in 2010.

5. Sweden's King Carl Gustaf took the throne in 1973. In the photo, he and Queen Silvia were married at Princess Victoria's wedding.(photo: wikipedia).

King Carl Gustaf attended a reindeer species protection program.(photo: Getty).

6. The Thai king just died of Bhumibol Adulyadej , reigning 70 years, as the savior of the nation for saving more than 8.3 million people when the drought persisted. For Thai people, he is their "soul" and "heart" .(photo: Reuters).