Explanation

The crown prince of Saudi Arabia is the second-most important position in Saudi Arabia, second to the King, and is his designated successor. 

Mohammed bin Salman (MBS) is the current crown prince, deputy prime minister((2022) and minister of defense of Saudi Arabia (2015–22)

Mohammed was appointed crown prince on 21 June 2017, following the King's decision to depose Muhammad bin Nayef 

ND30-4-2023