Apollos, an Alexandrian Jew, converted to Christianity about A. D. 54. He began (Acts xviii. 24) to preach at Ephesus, "knowing only the baptism of John," and was afterward instructed by Aquila and Priscilla, and sent into Achaia. At Corinth he was very popular, dividing fame with Paul and Peter, as it appears from that apostle's reference in 1 Cor. i. 12: "Every one of you saith, I am of Paul, and J of Apollos, and I of Cephas."