Lydia was a purple merchant in Philippi, where the agora can be seen in the excavations. She was a godly woman, that is, one who was not of Jewish origin, but had an interest in the monotheistic Jewish faith, attended the synagogue and was close to the Jewish community; thus she was open to Paul’s message and therefore received him and Silas in her house (Acts 16:14-15); accordingly, she was the head of the household, widow or an independent businesswoman.
In the Orthodox Churches, Lydia was given great devotion, she is described as apostle-like and depicted on numerous icons. Near Philippi there are few remains of an early basilica dedicated to it, a new Lydia church and a memorial on the site where, according to tradition, her baptism took place.
Joachim Schäfer: Article Lydia von Philippi, from the Ecumenical Dictionary of Saints – https://www.heiligenlexikon.de/BiographienL/Lydia_von_Philippi.html