Thailand's King Bhumibol Adulyadej, who was the world's longest-reigning monarch, died in hospital on Thursday, the palace said in an announcement. He was 88.
King Bhumibol reigned for seven decades after ascending the throne in 1946. His loss will be deeply mourned in Thailand, where he was regarded as a pillar of stability during decades of political upheaval and rapid development.
The palace did not give a reason for his death but he has been sick in hospital with various ailments for much of the past year.
"His Majesty has passed away at Siriraj Hospital peacefully," the palace said, adding he died at 15:52 (0852 GMT).