Pursuivant

noun

1. A follower
2. A functionary of lower rank than a herald, but discharging similar duties; called also pursuivant at arms; an attendant of the heralds, e.g. in the College of Arms.
3. A Grand Lodge Officer who guards the inner door during a meeting of the Grand Lodge
4. A royal messenger, one with the authority to execute warrants.
5. (law enforcement, by extension) A warrant officer.