Since 1995 he has grown into his role as de facto leader and enjoys widespread credibility among his people

Abdullah's exact birthdate is unknown, but he is widely believed to have been born in 1923, one of 37 sons - by 16 wives - of the late King Abd al-Aziz.

He was brought up in the desert according to Bedouin tradition, and learned their rugged and frugal lifestyle.

Today he drives a Rolls Royce with the registration 001, but his public image is one of relative piety in contrast to some of his more flamboyant contemparies.

At 79 years old, the crown prince remains a physically imposing presence, but is known as a gentle man. A chainsmoker, he speaks with a stutter and is far less austere than other Saudi leaders.

He reportedly greeted journalists arriving for a recent press conference in his garden wearing training shoes.

Limited reform

Since 1995 he has grown into his role as de facto leader. Abdullah has won praise from Saudi liberals for advocating reform.

Saudi Arabia remains a deeply traditional country

Analysts say that while the crown prince may not be about to radically liberalise Saudi society, he enjoys widespread credibility among his people.

He has allowed mild criticism of the government in the press, and hinted that more women should be allowed to work.

Saudi traditionalists appreciate his forthright manner, and welcomed his recent criticism of the United States' foreign policy, particularly in the Middle East and Afghanistan.