Now there came to Ephesus a Jew named Apollos, a native of Alexandria. He was an eloquent man, well-versed in the scriptures. He had been instructed in the Way of the Lord; and he spoke with burning enthusiasm and taught accurately the things concerning Jesus, though he knew only the baptism of John. He began to speak boldly in the synagogue; but when Priscilla and Aquila heard him, they took him aside and explained the Way of God to him more accurately. (Acts 18:24-26)

It is several years after the execution of John and the crucifixion of Jesus. Alexandria was the most sophisticated, principally Greek, city in the Eastern Mediterranean. It was also home of the largest community of Jews outside Jerusalem. It had its own intellectual and religious traditions.

Ephesus was a commercial, political, and religious center in what is now Western Turkey and was then at the core of Greek culture. Apollos is a Jew with a Greek name. He certainly spoke Greek, probably read Greek, and might well have been illiterate in Hebrew.

Apollos knew the Way of the Lord, but did not fully understand the Way of God, an interesting distinction. He knew only the baptism of John. Does this contrast with the baptism of the Holy Spirit or suggest broader differences?

Taken together, the testimonies of Josephus and Apollos seem to suggest a cult of John that continued after the prophet's death. And despite John's supposed monopoly, as argued by Crossan, may suggest continued baptisms for the repentance of sin after the demise of John.

We don't know what Priscilla and Aquila explained. But we can trace the work of Apollos with Paul in Corinth. St. Jerome relates that once the schism at Corinth was resolved Apollos became bishop there.