A more thorough explanation:

Fineannullando is a Latin term that refers to a writ used to disannul a conveyance of land in ancient demesne to the lord's prejudice. It specifically refers to a fine that was levied from a tenement which was of ancient demesne.

An example of fineannullando would be if a lord had granted a piece of land to a tenant, but later regretted the decision. The lord could use a writ of fineannullando to disannul the conveyance of the land and take it back from the tenant.

Another example would be if a lord had granted a piece of land to a tenant, but the land was actually part of the lord's ancient demesne. In this case, the lord could use a writ of fineannullando to disannul the conveyance and take back the land.

Fineannullando was a legal tool used in medieval England to protect the rights of lords over their ancient demesne lands. It allowed them to disannul any conveyances of land that were made to their prejudice, ensuring that they retained control over their lands. The examples illustrate how fineannullando could be used in different situations to protect the lord's interests.