This is a collection of over 5000 Latin works and over 5000 diplomatic charters. It was formerly divided into Series A and Series B. Series A consisted of over 4000 works in the Latin language by over 1000 authors, which originated in 1991 as the Cetedoc Library of Christian Latin Texts. Series B was a supplemental collection of over 1000 additional Latin works and over 5000 diplomatic charters. The two series have now been combined into one collection.

Contains more than 160 volumes of Greek material (with Latin translations) relevant to the study of the history of the Christian Church from its beginnings through the Council of Florence in 1439.

The first edition of Jacques-Paul Migne's Patrologia Latina, published between 1844 and 1855, and the four volumes of indexes published between 1862 and 1865. The Patrologia Latina comprises the works of the Church Fathers from Tertullian in 200 AD to the death of Pope Innocent III in 1216. Also contains the complete Patrologia Latina, including all prefatory material, original texts, critical apparatus and indexes. Migne's column numbers, essential references for scholars, are included.