A more thorough explanation:

Definition: Fiant is a term used in history that refers to a decree or commission. It can also mean a warrant to the Chancery of Ireland for a grant under the great seal.

Examples:

• A fiant was issued by the king to authorize the construction of a new castle.
• The lord chancellor signed a fiant granting land to a nobleman.

These examples illustrate how a fiant was used in historical contexts to authorize or grant something. In the first example, a fiant was used to authorize the construction of a new castle. In the second example, a fiant was used to grant land to a nobleman. Essentially, a fiant was a legal document that gave someone permission to do something or receive something.