The year A.D. 538 was a landmark year for the beginning of the fulfillment of an important time prophecy that spans the Middle Ages. It is essential, therefore, that those who follow the historicist method of interpreting prophecyestablish this fixed point as firmly as possible. Brother Heiks has done precisely that with this present study of the important events that occurred and documents what were developed that year. His related studies of A.D. 508 andA.D. 1798 are also recommended to complete this trilogy of important historical-prophetic studies. William H. Shea, MD, Ph.D.Former Professor: Old Testament DepartmentSeminary, Andrews UniversityFormer Associate: Biblical Research InstituteGeneral Conference of Seventh-day Adventists