The book of Philippians is a Prison Epistle (letter written while in prison). Paul wrote it about 62 A. D. as he anticipated his release from prison. They key personalities are the Apostle Paul, Timothy, Epaphroditus, Euodia, and Syntyche. It was written to show his appreciation and love to the Philippians in a thank-you letter for their continued help and support, and also to encourage their growth.