From CojsWiki
Greek inscription found at Sepphoris, tentatively dated to the fifth century CE, mentions Judah, the archisynagogos (leader of a synagogue) of Sidon, and Severianus Afrus, the archisynagogogs of Tyre.
Nagy, Rebecca, Sepphoris in Galilee: Crosscurrents of Culture. Raleigh: North Carolina Museum of Art, 1996.