The Kingdom of Hungary held a noble class of individuals, most of whom owned landed property, from the 11th century until the mid-20th century. Initially, a diverse body of people were described as noblemen, but from the late 12th century only high-ranking royal officials were regarded as noble. Most aristocrats claimed ancestry from chieftains of the period preceding the establishment of the kingdom around 1000; others were descended from western European knights who settled in Hungary. The lower-ranking castle warriors also held landed property and served in the royal army. From the 1170s, most privileged laymen called themselves royal servants to emphasize their direct connection to the monarchs. The Golden Bull of 1222 established their liberties, especially tax exemption and the limitation of military obligations. From the 1220s, royal servants were associated with the nobility and the highest-ranking officials were known as barons of the realm. Only those who owned allods – lands free of obligations – were regarded as true noblemen, but other privileged groups of landowners, known as conditional nobles, also existed.

The Golden Bull of 1222 was a golden bull, or edict, issued by Andrew II of Hungary. King Andrew II was forced by his nobles to accept the Golden Bull (Aranybulla), which was one of the first examples of constitutional limits being placed on the powers of a European monarch. The Golden Bull was issued at the year 1222 diet of Fehérvár. The law established the rights of the Hungarian nobility, including the right to disobey the King when he acted contrary to law. The nobles and the church were freed from all taxes and could not be forced to go to war outside of Hungary and were not obligated to finance it. This was also a historically important document because it set down the principles of equality for all of the nation's nobility. Seven copies of the edict were created, one for each of the following institutions: to the Pope, to the Knights Templar, to the Knights Hospitaller, to the Hungarian king itself, to the chapters of Esztergom and Kalocsa and to the palatine.