King Salman (Saudi Arabia) – King

FILE PHOTO: Saudi King Salman bin Abdulaziz addresses the kingdom's advisory Shura Council from his royal palace in Neom, Saudi Arabia, December 29, 2021, Saudi Press Agency/Handout via REUTERS

5. As of 2021, King Salman’s estimated net worth is around $18 billion USD, making him one of the wealthiest monarchs globally. Despite his advanced age, King Salman remains actively involved in governing the kingdom, with the support of his son, Crown Prince Mohammed bin Salman. King Salman’s legacy continues to evolve as Saudi Arabia navigates modern challenges and opportunities in the 21st century.