This static view of society was predicated on inherited positions. Commoners were universally considered the lowest order. The higher estates' necessary dependency on the commoners' production, however, often further divided the otherwise equal common people into burghers (also known as bourgeoisie) of the realm's cities and towns, and the peasants and serfs of the realm's surrounding lands and villages. A person's estate and position within it were usually inherited from the father and his occupation, similar to a caste within that system. In many regions and realms there also existed population groups born outside these specifically defined resident estates.