A tiny country with a small population, Brunei was the only Malay state in 1963 to choose to remain a British dependency rather than join the Malaysian Federation.
It became independent in 1984 and, thanks to its large reserves of oil and gas, now has one of the highest standards of living in the world.
Its ruling royals, led by the head of state Sultan Hassanal Bolkiah, possess a huge private fortune.
Hassanal Bolkiah, one of the world's longest-reigning monarchs, became sultan in October 1967 after his father, Sir Haji Omar Ali Saifuddin, abdicated. He was crowned in August 1968.