Romans is the first of the Epistles.
After the five Historical Books of the New Testament, the Bible continues with the Epistles. These are letters written to teach and instruct Christian doctrine. The first nine of the Epistles were written by Saint Paul, and the first is called Romans. It was written whilst Paul was in the Greek city of Corinth, around 56 AD, to the Christians in Rome, a place Paul had not yet visited. He writes to introduce himself and asks the people there to pray for him. In addition, Paul uses his letter to talk about righteousness which comes from God.
Romans 6:20-23
"For when ye were the servants of sin, ye were free from righteousness. What fruit had ye then in those things whereof ye are now ashamed? for the end of those things is death. But now being made free from sin, and become servants to God, ye have your fruit unto holiness, and the end everlasting life. For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord"