Haitham bin Tariq Al-Said was sworn in on Saturday as Oman’s new sultan to succeed his cousin Qaboos bin Said. The late Sultan Qaboos bin Said passed away on Saturday at the age of 79 after a four-year bout with cancer.

Qaboos reportedly returned from a trip in Belgium almost two weeks ago where he received colon cancer treatment.

Qaboos, the Arab world’s longest-serving ruler, was 28 years old when he overthrew his father, Said Bin Taimur, in a coup to become Sultan of Oman in 1970.