This reference work serves as a comprehensive encyclopedic resource for the study of the history, theology, and institutional development of the Christian Church. Edited by F. L. Cross, the volume compiles thousands of entries written by subject matter experts to provide historical context and theological definitions. It functions as a foundational reference tool for scholars, students, and clergy seeking precise information on ecclesiastical matters.

Scholars and theologians widely recognize this volume as a standard, authoritative reference work within the field of church history. Readers frequently note the academic density of the prose and the rigorous editorial standards applied to each entry.