Kuwait's Emir Sheikh Nawaf Al Ahmad Al Sabah died on Saturday age 86, according to the royal court, just over three years after assuming power in the U.S.-allied Gulf oil producer.

The cause of his death was not immediately disclosed. The emir was admitted to hospital late last month due to what the state news agency described at the time as an emergency health problem.

Crown Prince Sheikh Meshal Al Ahmad Al Jaber, 83, who has been Kuwait's de facto ruler since 2021, when the frail emir handed over most his duties, was named as Sheikh Nawaf's successor.