Envoy
Envoy , noun
[French envoyé envoy, from envoyer to send; pref. en- (Latin in) + voie way, Latin via: compare French envoi an envoy (in sense 2). See Voyage, and compare Invoice.]
1.
One dispatched upon an errand or mission; a messenger; esp., a person deputed by a sovereign or a government to negotiate a treaty, or transact other business, with a foreign sovereign or government; a minister accredited to a foreign government. An envoy's rank is below that of an ambassador.
2.
An explanatory or commendatory postscript to a poem, essay, or book; -- also in the French from, l'envoi.
The envoy of a ballad is the “sending” of it forth.