The word for today is…
emissary (noun):
1: one designated as the agent of another : representative
2: a secret agent
Source : Merriam -Webster
Etymology : An emissary is often a person who is sent somewhere in order to act as a representative. The key in that sentence is sent; emissary derives from Latin emissus, the past participle of the verb emittere, meaning "to send out." By the early 17th century, it was a commonly seen and heard word. An earlier common emittere descendant is emit. In addition, emittere itself comes from Latin mittere ("to send"), which is an ancestor of many English words, including admit, commit, mission, omit, permit, premise, promise, and submit. Like missionaries, emissaries are sent on missions. However, emissaries are more likely to be representing governments, political leaders, and nonreligious institutions, and an emissary's mission is usually to negotiate or to gather information. So a president may send a trusted emissary to a war-torn region to discuss peace terms. A company's CEO may send an emissary to check out another company that they may be thinking of buying. And a politician may send out an emissary to persuade a wealthy individual to become a supporter.
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