Their nobility was derived from their settlement in Székely Land as terra nullius (not yet belonging to anyone, including to the Hungarian king).
The wealthier primipilus, also called lófő ("chief horsemen") or equites, comparable to knights, and bound to take part in battle as cavalry soldiers.
[4] Later, the primors began to expand their power over the other two groups, attaining a status comparable to the higher aristocracy of medieval Hungary.
Under Stephen Bathory, in the 16th century, pixidarii were no longer exempt from paying taxes, barred from becoming elected officials[7] and could be forced to work as serfs,[8] de jure completing this process.
After Hungary came under Habsburg rule, Holy Roman Emperor Leopold I in his 1691 Diploma Leopoldinum confirmed the validity of Transsylvanian noble titles, including the primores.