Institutes of the Christian Religion
The threefold office or function of Christ was first presented by Eusebius of Caesarea. The theologians who followed Luther and Melanchthon down to the middle of the seventeenth century treat Christ's saving work under the two heads of king and priest. Calvin, in the first edition of his "Institutes of the Christian Religion" (1536), did the same, and it was not till the third edition (1559) and the Genevan Catechism that he fully presented the three offices. This convenient threefold division of the office of Christ was used by the theologians of both confessions during the seventeenth century. Ernesti opposed it, but Schleiermacher restored it.