A more thorough explanation:

Definition: An obsignator is a person who puts a seal on a document, usually as a witness. This was a common practice in ancient Roman law.

Example: In ancient Rome, when someone wrote a will, they would have an obsignator come and put a seal on it. This seal would show that the will was authentic and had not been tampered with.

Another example: A king might have an obsignator put a seal on a treaty with another country. This would show that the treaty was official and had the king's approval.

These examples illustrate how an obsignator was an important person in ancient times. They were responsible for making sure that important documents were authentic and had not been tampered with. Their seal was a symbol of trust and authority.