It's made up of princes empowered to elect the next crown prince.

BBC: Saudi royal health scare: Why it matters

As king, Salman might choose to nominate Ahmed as crown prince, or Salman might seek to do a deal with the more powerful senior princes represented on the Allegiance Council, in order to ensure their agreement to one of his own sons becoming crown prince.

BBC: Middle East

The building is regarded as the first stone castle built by the Welsh princes and was the stronghold of Rhys ap Gruffydd, prince of the medieval kingdom of Deheubarth.

BBC: Cardigan Castle: Work starts on ?11m restoration

It was one of the first stone castles to be built by the Welsh princes and was the stronghold of Rhys ap Gruffydd, prince of the medieval kingdom of Deheubarth.

BBC: Cardigan Castle: Steel supports removal in ?11m work

In addition to the battles Saudi women have been waging on the ground and behind the scenes for their rights, or lack there of, they have had a champion in Princess Ameera Al-Taweel, the wife of Prince Al-Waleed bin Talal, one of the more progressive of the thousands of Princes of the Saud family, and one of richest men in the world.

FORBES: A Woman's Place: Saudi Princes in Row Over Kingdom's Image