Nakharar system 
Medieval Armenia was divided into large estates, which were the property of an enlarged noble family and were ruled by a member of it, to whom the title of Nahapet "chief of the family" or tanuter master of the house was given. Other members of a Nakharar family in their turn ruled over smaller portions of the family estate. Nakharars with greater authority were recognized as ishkhans (princes).
This system has often been labeled as feudal for practical purposes; however, there are differences between this system and the feudal system later adopted in Western Europe. The estate as a whole was actually ruled by a single person, it was nonetheless considered the property of his whole enlarged family, so that, if the ruler died heirless, he was succeeded by a member of a different branch of the family. Furthermore, it was allowed to alienate a part of the family estate only to another member of the family or by permission of the whole enlarged family. This may also explain why Armenian feudal families were normally endogamic, in order not to scatter parts of their property, as would have happened if they had to give a part of their property to another family as dowry. It must also be noted that endogamic marriages had a religious reason too, particularly before Christianity, because Armenian paganism favored marriages between relatives very highly.
Each nakharar had his own army, depending on his domain. The national force or "Royal cavalry" was under the Sparapet, a "Commander in Chief" who presided over the whole of the nation. Schools and courts were all run by the Armenian clergy.
In 4th century Armenia, as in Parthia, large estates were hereditarily possessed by noble families and actually ruled by a member of them. The whole enlarged family was devoted to the worship of the same ancestors, lived in small fortified villages and spent most part of their time in hunting and in banqueting. Furthermore, each nakharar family had a particular social function: in Armenia a member of the Arshakuni family was chosen as king, who was consequently a sort of primus inter pares; among the Mamikoneans the chief general of the army (sparapet) was chosen, one of the Bagratunis was the chivalry chief (aspet or knight) and king crowner (tagadir), and so on.
History of the Nakharars 
The origin of the Nakharars seems to stretch back to pagan Armenia, who coexisted with the Roman and Parthian Empire, and they are mentioned to have pillaged many pagan temples when Armenia's conversion to Christianity began under Tiridates III.
The Nakharars survived the fall of the Arshakuni dynasty and the subsequent placement of the Marzban Governor-Generals by Sassanid king, and allowed a great deal of autonomy for the vassal state, up until the attempted conversion of Armenia to Zoroastrianism by Yazdegerd II, in which Vartan Mamikonian led a rebellion, and through the Battle of Vartanantz convinced the Persians that conversion would come at to high a price, eventually leading to the Nvarsak Treaty.
In western Armenia under Byzantine rule, Justinian's reform removed the martial role of the nakharars, as well as attempting to annex estates from Armenian nobles. The nakharars, angered at their restriction in power, began a full-scale insurrection that had to he quelled through swift military intervention, eventually sparking war with the Sassanids.
Though weakened by numerous invasions and the legal reforms of Kings, the nakharar structure remained virtually unchanged for many centuries and was finally eliminated during the Mongol invasions in the thirteenth century. Certain aspects of the nakharar system remained intact in Armenia until the early 20th century, when the noble class was altogether abolished by the Bolsheviks.
Works cited 
- Armenia and Iran in Encyclopædia Iranica
- "նախարար" in H. Ačaṙean (1926-35), Hayerēn Armatakan Baṙaran (Yerevan: Yerevan State University), 2nd ed., 1971-79