πρωτολόγος

ον
A. speaking first, and so = πρωταγωνιστής, Teles p.5 H.
II. ὁ π. ἄρχων the chief magistrate at Aphrodisias, CIG 2760, al.; at Iconium, ib.3992.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project