Acts of Paul and Thecla - Very old (Tertullian knows of it) and popular book that was not accepted as Scripture. God preserves St. Thecla's life and virginity through several miraculous deliverances.
Life of St. Thekla - A convert of the Apostle Paul during his imprisonment in Iconium, later given the title "Protomartyr." Article from the Self-Ruled Antiochian Orthodox Christian Archdiocese of North America.