Mohammed bin Salman Al Saud is the de facto ruler of Saudi Arabia. The heir apparent to the Saudi Arabian throne, he is currently Crown Prince and Prime Minister. He is the seventh son of King Salman of Saudi Arabia and grandson of the nation's founder, King Abdulaziz.
Mohammed in 2019
As chief of the crown prince court, 2014
With King Salman, Barack Obama and other leaders at the GCC summit in Saudi Arabia, 21 April 2016
With US secretary of state John Kerry (left) and Saudi foreign minister Adel al-Jubeir, 13 June 2016
An heir apparent or simply heir is a person who is first in an order of succession and cannot be displaced from inheriting by the birth of another person. A person who is first in the current order of succession but could be displaced by the birth of a more eligible heir is known as heir presumptive.
Throngs before the Imperial Palace in Japan awaiting the appearance of the Crown Prince Hirohito for the recent proclamation of his official recognition as the heir apparent to the Japanese Imperial Throne – New York Times, 1916.