διακηρυκεύεσθαι
From LSJ
ὡς χαρίεν ἄνθρωπος, ὅταν ἄνθρωπος ᾖ → how graceful is man when he is really a man | what a fine thing a human is, when truly human
Greek > English (Woodhouse Verbs Reversed)
(see also: διακηρυκεύομαι) communicate with by herald, negotiate by heralds
Lexicon Thucydideum
per caduceatorem agere, to negotiate through a herald, 4.38.2.