noun
emissary
EM-ih-sair-ee/ˈemɪseri/
A representative sent on a mission.
The emissary presents a sealed diplomatic envelope to the seated official.

Etymology
An emissary is literally someone sent out. The Latin noun named a scout or spy; the selected meaning retains the idea of a person dispatched on someone else’s mission.
In context
on the 25th of May 1453 the young Sultan sends an emissary to the emperor suggesting that he surrender
More examples
- The president sends an emissary to begin peace talks.
- Two emissaries arrive with an offer from the neighboring kingdom.
- She acts as the company's emissary in negotiations with local leaders.
Forms
emissary · emissaries