REUTERS/Damir Sagolj
Thailand's King Bhumibol Adulyadej waves as he returns to Siriraj Hospital after a ceremony at the Grand Palace in Bangkok on December 5, 2010.
Thailand's King Bhumibol Adulyadej died on Thursday at age 88, after holding the throne for 70 years.
He became king in 1946 and was honored as a demigod in the Southeast Asian country. However, he withdrew from public life over the last 10 years due to his deteriorating health, living at a Bangkok hospital.
With his death, the title of longest-reigning monarch will pass to Queen Elizabeth II. Below, you can see other rulers who've held their thrones for the longest.