Lydia (Greek: Λυδία) was a dealer of purple fabrics from Thyatira who believed in God.
Paul received a version directing him to Macedonia.
Now they passed through the territory of Phrygia and Galatia, after being forbidden by the Holy Spirit to speak the word in [the west coast province of] Asia [Minor]; and after they came to Mysia, they tried to go into Bithynia, but the Spirit of Jesus did not permit them; so passing by Mysia, they went down to Troas. Then a vision appeared to Paul in the night: a man from [the Roman province of] Macedonia was standing and pleading with him, saying,Come over to Macedonia and help us!And when he had seen the vision, we (including Luke) tried to go on into Macedonia at once, concluding that God had called us to preach the gospel to them.— Acts 16:6–16:10 (AMP)
Paul and his companions then traveled to Philippi in Macedonia. Lydia was living in Philippi at the time. Paul and his companions converted Lydia and her household to Christianity and baptized them. After this, she persuaded them to stay at her house.
A woman named Lydia, from the city of Thyatira, a dealer in purple fabrics who was [already] a worshiper of God, listened to us; and the Lord opened her heart to pay attention and to respond to the things said by Paul. And when she was baptized, along with her household, she pleaded with us, saying,If you have judged me and decided that I am faithful to the Lord [a true believer], come to my house and stay.And she persuaded us.— Acts 16:14–16:15 (AMP)
Lydia is the first documented convert to Christianity in the continent of Europe.
After dealing with the magistrates who had imprisoned them and their release from prison, Paul and his companions returned to Lydia's house, where they received encouragement and comfort.
So they left the prison and went to Lydia’s house; and when they had seen the brothers and sisters, they encouraged and comforted them, and left.— Acts 16:40 (AMP)