BANGKOK — King Bhumibol Adulyadej, revered in Thailand as a demigod, a humble father figure and an anchor of stability through decades of upheaval at home and abroad, died Thursday. He was 88 and had been the world’s longest-reigning monarch.

The Royal Palace said Bhumibol died “in a peaceful state” at Siriraj Hospital in Bangkok, where he had been treated for various health problems for most of the past decade.

During a reign that spanned 70 years, Bhumibol became much more than Thailand’s constitutional monarch. He was the nation’s one constant as governments rose and fell, a gentle leader who used his influence to unify the nation and rally troops through the Cold War as Thailand’s neighbors fell under communist control. In his heyday, the frail-looking, soft-spoken man in spectacles wielded so much power and respect he was able to squelch coups and rebellions with a gesture or a few well-chosen words.

Bhumibol was viewed by many in the majority Buddhist nation as a bodhisattva, or holy being who delays entering nirvana to aid the human race. But while junta leaders, prime ministers and courtiers approached him only on their knees, Bhumibol was remarkably down-to-earth. He hiked into impoverished villages and remote rice paddies to assess the state of his country. He played a half-dozen musical instruments and jammed with American jazz greats such as Benny Goodman.

Bhumibol was the world’s richest monarch and one of the planet’s wealthiest people: Forbes magazine estimated his fortune at more than $30 billion in 2011.

In the past decade, Bhumibol withdrew from public life because of illness and was often ensconced at Siriraj Hospital. His wife, Queen Sirikit, has also long been ailing and has been seen even more rarely.

Hundreds of weeping mourners stood outside the hospital Thursday, chanting prayers and looking up at the building.

Since army-staged coups in 2006 and 2014, political rivals had increasingly invoked the need to protect the palace as a pretext to gain or hold power, and some politicians have been sidelined by opponents who accused them of disrespecting the king, a grave crime in this Southeast Asian country. Although Bhumibol once said he is not above criticism, Thailand’s lese majeste law – the world’s harshest – has been routinely employed in recent years, with anyone charged with defaming the palace facing 15 years in jail.

Prime Minister Prayuth Chan-ocha said Crown Prince Maha Vajiralongkorn will become the new monarch, in accordance with the constitution. He said the government will notify the National Legislative Assembly, or parliament, of the succession.

Prayuth told reporters he had an audience with the prince hours after Bhumibol’s death, and Vajiralongkorn had asked for a delay in proclaiming him king so he could “take some time to mourn, together with the people of Thailand.”

With the king’s passing, the world’s longest-reigning monarch is Queen Elizabeth II, who ascended to the British throne in 1952.

Bhumibol Adulyadej (poo-me-pon ah-dun-yaa-det) was born Dec. 5, 1927, in Cambridge, Massachusetts, while his father, Prince Mahidol of Songkhla, was studying medicine at Harvard University.

Thailand has been a constitutional monarchy since 1932, with the prime minister and parliament holding political power and the king serving as head of state and placed in “a position of revered worship.”

Bhumibol ascended to the throne in 1946 when his brother, 20-year-old King Ananda Mahidol, was found dead of a gunshot wound to the head in a palace bedroom under circumstances that remain mysterious.

After the shooting, Bhumibol returned to school in Switzerland. In 1948, he was seriously injured in a road accident that left him blind in his right eye; Sirikit Kitiyakara, the daughter of a Thai aristocrat and diplomat, helped nurse him back to health. Bhumibol and Sirikit wed in 1950, a week before the coronation.

The name Bhumibol means “Strength of the Land,” and the bounty of Thailand’s soil and waters was the king’s passion. In 1952, he set out to breed a better freshwater fish, a staple of the Thai peasantry, in the ponds of his Chitralada Palace in Bangkok.

Over his reign, as Thailand hurtled from a traditional agrarian society of 18 million people to a modern, industrial country of 70 million, Bhumibol spearheaded more than 4,300 development projects. He traveled his nation to join village elders on a patch of grass to discuss the harvest or plot an irrigation ditch.

“They say that a kingdom is like a pyramid: the king on top and the people below,” he once told The Associated Press. “But in this country it’s upside down. That’s why I sometimes have a pain around here.” He pointed to his neck and shoulders.

Usually in the background, the king stepped forward at crucial moments. During a pro-democracy uprising in 1973, he ordered the gates of the Grand Palace to be opened to students fleeing the gunfire of troops loyal to a dictatorial triumvirate. The message was clear, and the trio went into exile. Amid another bloody confrontation in 1992 between the military and pro-democracy protesters, the king called in the two key protagonists, who prostrated themselves before him on nationwide TV and promised peace. The crisis ended immediately.

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