Crispus, the chief ruler of the synagogue, believed on the Lord with all his house - an event felt to be so important that the apostle deviated from his usual practice (1Co 1:14-16) and baptized him, as well as Caius (Gaius) and the household of Stephanas, with his own hand [Howson].
many of the Corinthians ... believed and were baptized - The beginning of the church gathered there.