Paul and Silas went to Macedonia to preach about Jesus. They went to a riverbank outside the town of Philippi. Some women were present there. Lydia was a woman in the crowd and she became a Christian.

Acts 16:13-15

13 On the Sabbath we went a little way outside the city to a riverbank, where we thought people would be meeting for prayer, and we sat down to speak with some women who had gathered there.14 One of them was Lydia from Thyatira, a merchant of expensive purple cloth, who worshiped God. As she listened to us, the Lord opened her heart, and she accepted what Paul was saying. 15 She and her household were baptized, and she asked us to be her guests. “If you agree that I am a true believer in the Lord,” she said, “come and stay at my home.” And she urged us until we agreed.