A more thorough explanation:

PROAVUS

Proavus is a legal term used in civil law to refer to a person's great-grandfather.

For example, if your father's grandfather is still alive, then he is your proavus. Similarly, if your mother's grandmother is still alive, then she is also your proavus.

Another example would be if you were researching your family tree and discovered information about your great-grandfather, you could refer to him as your proavus.

The term proavus is used specifically in civil law to refer to a person's great-grandfather. It is important to understand this term when researching family history or when discussing legal matters related to inheritance or property rights.