The aged king of Saudi Arabia led a burial ceremony for his brother, Crown Prince Nayef Abdul-Aziz, in the holy city of Mecca before his interment following evening prayers.
He was the second heir to the throne to die outside the country in less than a year. The 88-year-old King Abdullah gathered with royal family members and international envoys for the service.
Prince Nayef's wrapped body was carried through crowds of relatives in a ceremony broadcast live on several television channels.
Abdullah has now outlived two appointed successors from among the elderly group of sons of Saudi's founding monarch, King Abdul-Aziz.
Health issues increasingly preoccupy the ruling inner circle in Saudi Arabia and show the vivid contrast between a leadership born at the dawn of Saudi's oil-rich age and the current population heavily weighted toward youth - with more than half under 25 years old.
Saudi authorities have led the efforts in the Western-allied Gulf to counter Arab Spring-inspired calls for reforms, using a combination of crackdowns, intimidation and lavish spending to offer state jobs and handouts.
Gulf officials have proposed closer cooperation on security matters, including monitoring social media.
The 78-year-old Nayef, the country's interior minister, was considered wary of even the modest changes brought by King Abdullah, including pledges to allow women to vote and run in the next municipal elections in 2015.
Women activists had planned to mark the anniversary of a campaign to challenge the ultra-conservative kingdom's ban on female driving, but they postponed the protests because of the official mourning period for Nayef.
The leading figure as the next heir to the throne, 76-year-old Defence Minister Prince Salman, also is not viewed as a dynamic reformer willing to confront the behind-the-scenes power centre in Saudi Arabia - the Islamic religious establishment that gives the monarchy its legitimacy to rule.