Note 1 at Acts 16:14: Lydia was a merchant from Thyatira (see note 2 at this verse) in Lydia of Asia. She was Paul's first convert in Europe although her hometown was in Asia. She was already a worshipper of God before Paul shared the gospel with her. This verse implies that Lydia was the only woman of the group who received the gospel and it specifically states that the Lord opened her heart so that she listened to Paul's words. Verses 15 and 40 mentions Paul and Silas entering into Lydia's house in Philippi. This, along with the fact that verse 15 mentions her household being converted, leaves no doubt that she had a residence in Philippi. The residents of Thyatira were famous for their skill in dying purple which is, no doubt, where Lydia became associated with her trade of the selling of purple. Therefore, there is a definite link between Lydia and Thyatira and she may have maintained residences in both cities.

It is evident from Rev. 1:11 and 2:18-24 that Thyatira had a Christian church. Since the scriptures don't mention Paul ministering in Thyatira, it is possible that Lydia is the one the Lord used to introduce the gospel to that town.

Note 2 at Acts 16:14: Thyatira was a city in Asia (see note 3 at Acts 16:6, p. ???) in the province of Lydia. It was on the road between Pergamos and Sardis. The people of Thyatira were well known for their skill in the dying of purple and Lydia, a seller of purple, came from there. There is no record of Paul ministering in Thyatira, but a Christian church was established there possibly from Lydia's witness or others that Paul had evangelized in Asia.