Abu Bakr al-Baghdadi sought to establish a new Islamic “caliphate” across Syria and Iraq, but he might be remembered more as the ruthlessly calculating militant leader of the Islamic State group who brought terror to the heart of Europe and set up a short-lived organization so extreme that it was shunned even by al-Qaida.

With a $25 million United States bounty on his head, al-Baghdadi steered his chillingly violent but surprisingly disciplined followers into new territory by capitalizing on feelings of Sunni supremacy and disenfranchisement at a time of tumult that followed the Arab Spring.

He was one of the few senior IS commanders still at large after two years of steady battlefield losses. He was believed to be 48.

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Militants under his command were some of the first jihadis to grow up with the internet, and they deftly exploited social media to tout their military successes, document their mass slaughter, beheadings and stonings, and promote their cause to a global audience.

The Islamic State suffered steady battlefield losses that saw its territory shrink from an area the size of Britain to a speck in the Euphrates River valley. The announcement of his death came nearly two years after Iraq announced the defeat of IS and five years after the group humiliated its armed forces and seized nearly a third of the country.

In April, U.S.-backed Kurdish-led forces in Syria declared the group’s territorial defeat after liberating the village of Baghouz in eastern Syria, its last bastion. Though at minimum a symbolic victory for Western counterterrorism efforts, his death would have unknown practical impact on possible future attacks. He had been largely regarded as a symbolic figurehead of the global terror network, and was described as “irrelevant for a long time” by a coalition spokesman in 2017.