The Death Anniversary of King Bhumibol Adulyadej is observed in Thailand every October 13. This day commemorates the passing of King Bhumibol, who died on October 13, 2016, at the age of 88 after a long illness. Following his death, a year-long period of mourning was declared, and the anniversary was established as a public holiday to honor his memory and numerous accomplishments. Bhumibol, also known as Rama IX, was the longest-reigning monarch in Thai history and the world's longest-serving head of state, having ascended the throne in 1946. During his reign, he gained significant popularity and played a crucial role in Thailand's political landscape, contributing to the country's transition to a democratic system. On this day, many people in Thailand pay tribute to the beloved monarch, reflecting on his legacy and the impact he had on the nation.