Acts 18:8

And Crispus, the chief ruler of the synagogue It is better to omit "chief" otherwise this part of the word is twice translated. (So R. V.) This Crispus is alluded to, 1 Corinthians 1:14, as one of the few whom St Paul himself baptized. His previous distinguished position among the Jews, and the conversion of his whole family, would make him noticeable among the Christian converts. There may have been more than one synagogue in Corinth. In Acts 18:17 we read of Sosthenes, the ruler of the synagogue. But it is quite possible that this man may have been appointed immediately after the conversion of Crispus, and may have been desirous to shew his zeal against the Christian teachers by laying an immediate information against Paul before the proconsul.

and many of the Corinthians … were baptized St Paul mentions that he himself only baptized (in addition to Crispus) Gaius and the household of Stephanas. But Silas and Timothy were now by his side and would care for the admission of the new converts to baptism.