A year after King Salman bin Abdul-Aziz Al Saud made his son Mohammed bin Salman crown prince, the 32-year-old remains dependent on his father’s legitimacy and credentials to be the heir apparent. Prince Mohammed has polarized the House of Saud more than any figure in more than half a century.

Last summer, the king removed Prince Mohammed bin Nayef from the No. 2 position in the kingdom with no explanation and elevated his son. Nayef had successfully defeated al-Qaeda in Saudi Arabia, foiled terrorist attacks in the United States and Europe, and survived numerous al-Qaeda assassination attempts. Since his removal from the line of succession, he has been under house detention and all of his communications are being monitored. He has little access to outsiders, and his bank accounts were frozen last November.

The Nayef wing of the Saudi royal family has dominated the Ministry of the Interior since the 1970s. It’s an enormous bureaucracy filled with people who owe their jobs to the Nayef clan. Security sources say its morale has declined since he was removed.

Numerous sources have now confirmed that another senior prince has been under detention since last fall’s wave of arrests of senior officials from the royal family and other prominent families in the kingdom. Most of those arrested were never charged with any crimes and were released only after paying extortion money.