The Epistle to the Colossians is officially titled The Epistle of Paul to the Colossians but often referred to simply as Colossians.  The book was written by Paul the Apostle and Timothy and addressed to the Church in Colossae, a small Phrygian city near Laodicea.  Paul had never visited Colossae and thus the tone of his letter was more personal.  This was important because the letter was written to chastise the heretical teachers who had infiltrated the Colossian church.  The book was written around 60 AD while Paul was imprisoned in Rome.