The issue of womens' role in the church is not as clear cut as some people would want to think. The letters of Paul, which date to the middle of the first century AD, provide some clues. For example, Paul greets Prisca, Junia, Julia, and Nereus' sister, who worked and traveled as missionaries in pairs with their husbands or brothers (Romans 16:3, 7, 15) as equals and co-workers. Junia is praised as a prominent apostle, imprisoned for her faith. Mary and Persis are commended for their hard work (Romans 16:6, 12). Euodia and Syntyche are called his fellow-workers in the gospel (Philippians 4:2-3). Women were the leaders of house churches (Apphia in Philemon 2; Prisca in I Corinthians 16:19), Lydia of Thyatira (Acts 16:15) and Nympha of Laodicea (Colossians 4:15). Women held offices and played significant roles in group worship, such as the deacon Phoebe (Romans 16:1) and women were certainly praying and prophesying during worship (I Corinthians 11). An order of widows served formal roles of ministry (I Timothy 5:9-10). Women prophets included Mary Magdalene, the Corinthian women, Philip's daughters, Ammia of Philadelphia, Philumene, the visionary martyr Perpetua, Maximilla, Priscilla (Prisca), and Quintilla.