I'm interested in what sort of honorific titles might be used in the Greco-Roman world when addressing members of the nobility who were ranked below kings, emperors, etc, and who lacked a specific titled job like, "governor,"
Would "Sir," or "My Lord," be appropriate? If not, what was used instead, if anything?
For instance how might a servant address Alcibiades, or a member of the Roman senate?
Slaves definitely had specific terms to refer to their masters: dominus/δεσπότης, or domina/δέσποινα for a lady. These would eventually become terms of address for the emperor - δεσπότης was an ancient (as in, Alcibiades-era) term, but it was used in the Byzantine period to refer to/describe the emperor.
I don't know about any office-specific titles, though! I presume you could always have fallen back on "Quaestor/Archon So-and-So," but I'm not sure if there were specific terms of address, or if there was ever anything like a T-V distinction for referring to nobility in antiquity.