Crown Prince of Saudi Arabia, Mohammed ben Salman (known as MBS) is - at only 34 years old - at the head of a State in Western Asia which has immense oil reserves and weighs on the world economy. This country is also home to the main holy places of Islam and remains the world's largest arms buyer. Accused of the barbaric assassination of a journalist, the kidnapping of a foreign Prime Minister, engaged in a bloody war in Yemen, determined to counter Iran at all costs, MBS is also a key partner in the fight against terrorism, carries out spectacular reforms that change the face of his kingdom.