A more thorough explanation:

Definition: A libelant is the person who initiates a lawsuit in an admiralty or ecclesiastical court by filing a libel.

For example, if a ship owner believes that a cargo company has breached their contract, the ship owner can file a libel against the cargo company in an admiralty court. In this case, the ship owner is the libelant.

Another example is if a member of a church believes that a church leader has acted improperly, they can file a libel against the church leader in an ecclesiastical court. In this case, the member is the libelant.

Overall, a libelant is the person who brings a case to court by filing a libel, which is a written statement of the plaintiff's claims against the defendant.