Epistle of James
Epistle of James refers to the writings of James, son of Alpheus, the Bishop of Jerusalem, the Lord's brother and one of the twelve Apostles. It may be one of the earliest written works of the New Testament, possibly as early as the late 40s. The early Universal Church years, much of his work was disputed as to authenticity and scattered among churches. From the end of the third century its acceptance as inspired, canonical and as the work of St. James clearly appears from the various lists of the Sacred books drawn up since the fourth century. 
Martin Luther had difficulty with the Epistle of James as it did not easily fit his concept of justification by faith alone as James also seems to stress the importance of works. Nevertheless, he kept it as a part of the New Testament canon in Protestant Churches.