Its efforts culminated in a series of articles confirming the privileges of the aristocracy and the cities and circumscribing the power of the monarchy known as the Magna Carta of Aragon.
In 1283, the nobles and burghers of Aragon held a court (cortes) in Zaragoza at which they swore to uphold each other's rights.
At both, Peter III had to recognise the ancient customs and fueros of the people and vow to summon the cortes annually.
The Privilege devolved many royal functions to the lesser nobility and the Crown of Aragon nearly fell into anarchy, especially during the reign of Peter IV.
"[5] The Privilege ordained that the king could not proceed against any nobleman without the prior permission of the Justicia acting on the approval of the cortes.