Prince Talal bin Abdul Aziz, the half-brother of Saudi king Salman bin Abdul Aziz, died on Saturday at the age of 87, the father of billionaire Prince Alwaleed bin Talal, known for his "reformist" demands in the ruling Al-Saud family.

Alwaleed wrote on Twitter that the family would receive condolences Sunday, Monday and Tuesday at his residence in Riyadh.

Prince Talal was born in 1931, the 18th son of the founding monarch, Abdul Aziz. He entered political life as minister of transport in 1952 and served as finance minister and was appointed ambassador to France.

In the early 1960s, the late Amir formed the Free Princes Movement, which demanded fundamental reforms in Saudi Arabia and moved abroad after calling for a constitutional monarchy, but later returned home.

Prince Talal has directed the Arab Gulf Program for United Nations Development Organizations, which is concerned with education and health, especially for women in developing countries. He is famous for his demand to allow his country's women to drive the car.

Prince Talal resigned from the Allegiance Commission in 2011, and a picture taken last year by King Salman showed his hand in a wheelchair when the king visited him after the arrest of his son in the autumn of 2017 to console the death of his sister Princess Madawi.

Earlier this year, Prince Abdul Aziz bin Talal said his father was taken to the hospital for routine tests after publishing information about his entering a hunger strike to protest the continued detention of three of his sons, most notably Alwaleed.