(CNN) Oman named a new ruler Saturday, hours after it announced the death of Sultan Qaboos bin Said, state media reported.

Qaboos was 79, and ruled Oman for five decades before his death Friday. He overthrew his father in a bloodless coup in 1970, becoming the longest serving Arab leader. The Omani government declared three days of national mourning.

Haitham bin Tariq al-Said has been named as the new ruler, according to state-run Oman News Agency.

Qaboos did not have children or a direct heir at the time of his death. The Omani Constitution calls on the royal family to choose a new sultan within three days.

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