However, Nayef remained hugely influential and enjoyed a lot of support among the powerful clerical establishment.
He oversaw the feared religious police and developed a security apparatus that contributed to the failure of militant Islamic groups such as al-Qaeda to capitalise on early successes in Saudi Arabia after the 2001 war in Afghanistan. But he was criticised for imprisoning human rights activists and political campaigners.
As revolts last year rocked the kingdom's neighbours, King Abdullah ordered a package of pay rises, subsidies, housing grants and job creation schemes. Nevertheless, social and economic problems remain.
The King, who has pushed planners to prepare for a time when the state can no longer rely solely on oil for revenue, enjoys a degree of popularity that few senior Saudi royals can match.Observer