Acts 8:27. And he arose and went: and, behold, a man of Ethiopia, an eunuch of great authority under Candace queen of the Ethiopians, who had the charge of all her treasure, and had come to Jerusalem for to worship,
The above is just a throw-of-the-dart. I am not sure the answer to this question is specifically stated in scripture. At pentecost when the Holy Spirit arrived, many Gentiles heards "the woderful works of God".
Acts 2:
9. Parthians, and Medes, and Elamites, and the dwellers in Mesopotamia, and in Judaea, and Cappadocia, in Pontus, and Asia,
10. Phrygia, and Pamphylia, in Egypt, and in the parts of Libya about Cyrene, and strangers of Rome, Jews and proselytes,
11. Cretes and Arabians, we do hear them speak in our tongues the wonderful works of God.
and many people accepted Christ, some may have been Gentiles.
Acts 2:
41. Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls.
42. And they continued stedfastly in the apostles' doctrine and fellowship, and in breaking of bread, and in prayers.
I would recommend the reading all of Acts 2 to understan in context.
Good Day and God Bless