More than his guarded and hidebound predecessors, Abdullah assertively threw his oil-rich nation’s weight behind trying to shape the Middle East. His priority was to counter the influence of rival, mainly Shiite Iran wherever it tried to make advances.

He and fellow Sunni Arab monarchs also staunchly opposed the Middle East’s wave of pro-democracy uprisings, seeing them as a threat to stability and their own rule.

Tehran and Riyadh’s colliding ambitions stoked proxy conflicts around the region that enflamed Sunni-Shiite hatreds — most horrifically in Syria’s civil war, where the two countries backed opposing sides. Those conflicts in turn hiked Sunni militancy that returned to threaten Saudi Arabia.

And while the king maintained the historically close alliance with Washington, there were frictions as he sought to put those relations on Saudi Arabia’s terms. He was constantly frustrated by Washington’s failure to broker a settlement to the Israel-Palestinian conflict. He also pushed the Obama administration to take a tougher stand against Iran and to more strongly back the mainly Sunni rebels fighting to overthrow Syrian President Bashar Assad.

Abdullah’s death was announced early today. His anointed successor is his 79-year-old half-brother, Prince Salman, who has recently taken on the ailing Abdullah’s responsibilities, according to the official Saudi Press Agency.

Abdullah was born in Riyadh in 1924, one of the dozens of sons of Saudi Arabia’s founder, King Abdul-Aziz Al Saud. Like all Abdul-Aziz’s sons, Abdullah had only rudimentary education. He felt more at home riding stallions and hunting with falcons.

Abdullah was selected as crown prince in 1982 when his half-brother Fahd ascended to the throne. The decision was challenged by a full brother of Fahd, Prince Sultan. But the family eventually closed ranks behind Abdullah.

Abdullah became de facto ruler in 1995 when a stroke incapacitated Fahd. Abdullah was believed to have long rankled at the closeness of the alliance with the United States, and as regent he pressed Washington to withdraw the troops it had deployed in the kingdom since the 1990 Iraqi invasion of Kuwait. The U.S. finally did so in 2003.

When President George W. Bush came to office, Abdullah again showed his readiness to push against Washington. In 2000, Abdullah convinced the Arab League to approve an unprecedented offer that all Arab states would agree to peace with Israel if it withdrew from lands it captured in 1967. The next year, he sent his ambassador in Washington to tell the Bush administration that it was too unquestioningly biased in favor of Israel and that the kingdom would from now on pursue its own interests apart from Washington’s.

Alarmed by the prospect of a rift, Bush soon after advocated for the first time the creation of a Palestinian state alongside Israel.

The next month, the Sept. 11, 2001 terror attacks took place in the United States, and Abdullah had to steer the alliance through the resulting criticism. The kingdom was home to 15 of the 19 hijackers, and many pointed out that the baseline ideology for al-Qaida and other groups stemmed from Saudi Arabia’s Wahhabi interpretation of Islam.

When al-Qaida militants in 2003 began a wave of violence in the kingdom aimed at toppling the monarchy, Abdullah cracked down hard. For the next three years, security forces battled militants, finally forcing them to flee to neighboring Yemen. There, they created a new al-Qaida branch, and Saudi Arabia has played a behind-the-scenes role in fighting it.

When Fahd died in 2005, Abdullah officially rose to the throne. He then began to more openly push his agenda.

His aim at home was to modernize the kingdom to face the future. One of the world’s largest oil exporters, Saudi Arabia is fabulously wealthy, but there are deep disparities in wealth and a burgeoning, young population in need of jobs, housing and education. For Abdullah, that meant building a more skilled workforce and opening up greater room for women to participate.

Any change, however, was strictly on the royal family’s terms. After the 2011 Arab Spring uprisings, Saudi Arabia clamped down on dissent. Riot police crushed street demonstrations by Saudi Arabia’s Shiite minority. Dozens of activists were detained, many of them tried under a sweeping counterterrorism law by an anti-terrorism court Abdullah created.

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