Acts 18:8

18:8 Crispus, the president of the synagogue, believed in the Lord together with his entire household, and many of the Corinthians who heard about it believed and were baptized.

Acts 18:17

18:17 So they all seized Sosthenes, the president of the synagogue, and began to beat him in front of the judgment seat. Yet none of these things were of any concern to Gallio.