BANGKOK >> Prem Tinsulanonda, who as an army commander, prime minister and adviser to the royal palace was one of Thailand’s most influential political figures over four decades, died today at age 98.

A statement from the palace said Prem died of heart failure at Bangkok’s Phra Mongkutklao hospital, and had served the throne loyally, contributing beneficially to the country.

Prem was best known for his long-standing devotion to the monarchy, especially the late King Bhumibol Adulyadej, who appointed him to his Privy Council immediately after Prem’s eight years as prime minister, and named him head of that powerful advisory body in 1998, a position he held until his death.

Prem is credited by scholars with establishing the unspoken primacy of the palace in Thailand’s power structure, cementing a mutually beneficial alliance with the military.

“He essentially forged and sustained a partnership between monarchy and military with the latter as junior partner up until today,” said Paul Chambers, a political scientist at Naraesuan University in northern Thailand.

Prem was prime minister from 1980 to 1988, and helped usher in a period of relative stability after a successful pro-democracy uprising against a military dictatorship in 1973, a counter-revolution and coup in 1976 and another coup in 1977, as well as edginess about communist takeovers in neighboring Indochina in 1975.

While most Thai army commanders came to the position through coups, Prem was elected constitutionally by parliamentary vote, though he never ran for office. As prime minister, he weathered two attempted coups and was reportedly the target of several assassination plots.

Critics questioned his devotion to democracy, and accused him of encouraging, if not engineering, the 2006 coup that ousted elected Prime Minister Thaksin Shinawatra.

He denied such allegations, but in the months preceding the military takeover, he frequently spoke out about corruption and greed in government — a major accusation against Thaksin by his critics — and strongly advised in public speeches to army and navy cadets that their loyalty was to king and country, not the government.

Ironically, Prem’s barely veiled backing of the coup set in motion events that contributed to a decline in the near-universal respect for the monarchy, because of the perception among the popular Thaksin’s supporters that the palace was taking sides in politics, something it publicly always denied doing under the system of constitutional monarchy.

“That coup was probably Prem’s last major political intervention, and it was one where he misjudged,” Kevin Hewison, a professor emeritus at the University of North Carolina and veteran Thai studies scholar, said in an email interview today. “He expected elation and praise for his open role in getting rid of Thaksin. Instead, his intervention lit the fuse of a political polarization that continues to haunt Thailand’s elite.”

The coup set off a sometimes violent battle for power between Thaksin’s opponents and his political allies, who despite electoral victories were forced time and again from office, culminating in another coup in 2014. An election in March this year is set to install a government in the near future, but constitutional changes ensure the military will keep elected politicians on a tight leash.

Prem retained his role as a behind-the-scenes power broker after the 2006 coup, especially as King Bhumibol was in ill health for much of the decade before his death in 2016.

Prem, in apparently vigorous health for his age until recently, looked frail at two recent public appearances: voting in the March general election and the formal coronation of Bhumibol’s son, King Maha Vajiralongkorn, earlier this month.

Prem was born in the major southern fishing port of Songkhla on Aug. 26, 1920. He attended the prestigious Chulachomklao Royal Military Academy in Bangkok and later U.S. Army schools. He began his military career in 1941 as a second lieutenant in a tank regiment.

He first achieved national prominence in 1974-77, when as regional army commander in Thailand’s poor rural northeast he stressed development and civic action instead of military might in a successful campaign against communist insurgents. As prime minister, he continued using policies of amnesty and other political means to prompt defections from the communist guerrilla movement.

Junior officers pushed a reluctant Prem into taking the prime minister’s job in 1980, when Thailand was facing an ailing economy and perils on the border with Cambodia, which had been occupied by Vietnamese forces who had driven out the communist Khmer Rouge regime but also sent hundreds of thousands of refugees into Thailand. At the same time, Thailand expanded ties with China and allies in the West, Japan and Southeast Asia.

Prem was appointed deputy interior minister in 1977 and later army commander and defense minister. He became prime minister in March 1980, after the resignation of Kriangsak Chamanand, another former military leader.

The border crisis with Cambodia eased over time, and Prem had the good luck to preside over the birth of Thailand’s economic boom, which ended only with Asia’s devastating 1997 financial crisis.

Thitinan Pongsudhirak, a political scientist at Bangkok’s Chulalongkorn University, credited Prem with keeping the military at arm’s length from politics by warding off the coup attempts in 1981 and 1985, and checking elected politicians from excessive graft by shielding the Finance Ministry and macro-policy agencies, particularly the Central Bank, from domestic politics.

But Prem showed little appetite for public political activity, and was dubbed by some academics as suffering from “reluctant ruler syndrome.” Critics accused him of indecision and lacking in imagination, and influential businessmen criticized his government’s austere economic policies. His aloof manner, bordering on arrogance, didn’t help his popularity.

“Prem disliked the cut-and-thrust of parliamentary politics, disdained elected politicians as the source of Thailand’s corruption, and he seldom appeared in parliament,” said Hewison, the Thai studies scholar. “As prime minister, Prem established a system of government that has been a model for the current military junta.”

Prime Minister Prayuth Chan-ocha, the junta leader who seized power in 2014, praised Prem as “a role model for Thais who love the country,” according to a statement from deputy government spokesman Werachon Sukondhapatipak.

“He was honest and cared for the betterment of society. He also had other characteristics about him that future generations should learn from,” the statement cited Prayuth, another former army commander, as saying.

A later government statement called Prem a “hero,” and said that flags would be lowered to half-staff for seven days in his honor and that civil servants would dress appropriately for mourning for three weeks.

Never married, Prem leaves no family survivors. Thailand’s Princess Sirindhorn will preside over his initial Buddhist funeral rites on Monday.

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Associated Press writer Kaweewit Kaewjinda contributed to this report.