A more thorough explanation:

SUBFEUDUM

Subfeudum is a Latin term used in historical law to refer to a subfee, which is a piece of land that is granted to a tenant by a feudal lord.

An example of subfeudum is when a lord grants a piece of land to a tenant, who then becomes responsible for managing and cultivating the land. The tenant may also be required to provide military service or other forms of support to the lord in exchange for the use of the land.

Another example of subfeudum is when a tenant sublets a portion of their land to another tenant, creating a sub-subfee. This can create a complex hierarchy of land ownership and obligations.

The examples illustrate how subfeudum was used in feudal societies to establish a system of land ownership and obligations. The lord granted land to tenants, who then became responsible for managing and cultivating the land, as well as providing support to the lord. This system created a hierarchy of land ownership and obligations, with the lord at the top and the tenants at the bottom. The concept of subfeudum allowed for the creation of sub-fees and sub-subfees, which further complicated the system of land ownership and obligations.