Saint Lydia was born during the first century in Thyatira, a town famous for its dye works in Asia Minor, famous for its dye works, (hence, her name which means purple seller). She was a seller of purple dye and was St. Paul's first convert at Philippi. The following is from the Acts of the Apostles:
And a certain woman named Lydia, a seller of purple, of the city of Thyatira, one that worshipped God, did hear: whose heart the Lord opened to attend to those things which were said by Paul. And when she was baptized, and her household, she besought us, saying: If you have judged me to be faithful to the Lord, come into my house, and abide there. And she constrained us (Acts 16:14-15).
She was baptized with her household. Thereafter, Paul made his home with her while in Philippi.
Lydia was a woman of hospitality, a woman of faith. As a successful businesswoman she most likely had a home spacious enough to welcome guests and to use her home as a Christian center, where others would gather for the Holy Mass and prayer. After Paul and Silas were released from prison, they went immediately to Lydia’s house to see and encourage the believers gathered there. Lydia served the Lord through her gift of hospitality by welcoming others into her home.
— Excerpted from Catholic Fire