From Ed's link.

"Is the idea of a caliphate unique to ISIS?

No.

Nearly all Sunni political Islamist movements dream of the eventual resurrection of the caliphate, most by political means, though jihadi groups call for establishing it by violence.

It has been the ultimate ambition of al-Qaeda, but while its late leader Osama bin Laden could once claim leadership of the international jihadi movement, he never went so far as to declare himself caliph."