Saudi Arabia

a. The system of government in Saudi Arabia shall be monarchical.
b. The dynasty right shall be confined to the sons of the Founder, King Abdul Aziz bin Abdul Rahman Al Saud (Ibn Saud), and the sons of sons. The most eligible among them shall be invited, through the process of "bai'ah", to rule in accordance with the Book of God and the Prophet's Sunnah.
c. The King names the Crown Prince and may relieve him of his duties by Royal Order.
… (Basic Law, Art. 5)

The powers of the State shall comprise:
• The Judicial Power
• The Executive Power
• The Organizational Power
All these powers shall cooperate in performing their duties according to this Law and other regulations. The King is the ultimate source of all these authorities. (Basic Law, Art. 44)

The King shall undertake to rule according to the rulings of Islam and shall supervise the application of Shari'ah, the regulations, and the State's general policy as well as the protection and defense of the country. (Basic Law, Art. 55)

a. The King shall appoint the Deputy Prime Minister and Cabinet Ministers and may relieve them of their duties by a Royal order.
… (Basic Law, Art. 57)

The King shall appoint ministers, deputy ministers and officials of the "excellent grade" category and he may dismiss them by a Royal order in accordance with the rules of the law. … (Basic Law, Art. 58)

The King shall be the Supreme Commander of the armed forces … (Basic Law, Art. 60)