A more thorough explanation:

RETENTA POSSESSIONE

Retenta possessione is a Latin term used in history to refer to the act of retaining possession of something.

• After the death of her husband, the widow was allowed to continue living in the family home retenta possessione.
• The conquerors of a land would often allow the previous rulers to keep their titles and lands retenta possessione.

The examples illustrate how retenta possessione was used to describe situations where someone was allowed to keep possession of something, even if there was a change in ownership or control. In both examples, the individuals were able to retain their possession of the property despite changes in circumstances.