This is a greeting of those who are leaving or even arriving; it is placed at the beginning of letters.[1]
"Cheers", a salutation. Some consider it to be placed late in letters; in this way simply to correspond with each other as Amasis said these things to Polycrates.[2] Eubulus the comic [playwright] said that Kleon was the first to write a letter this way to the Athenians [sc. who had returned safely] from Sphakteria,[3] at which he was also quite pleased, [Eubulus] not knowing that the ancients had used [this word] and had thus greeted one another, not only when first they met (as we do) but also on taking leave from one another, instead of "good health"[4] and "be well" they bade one another to "take joy".