 Texts in the CR are written in either Latin, French or German (using "Fraktur" typefaces).A collection of sixteenth century Catholic writings, intended as a counterpart to the Corpus Reformatorum, was begun by Professor Joseph Greving (1868–1919) of the University of Bonn in 1915.It was announced that same year in the "Theologische Revue" as a "Plan für ein Corpus Catholicorum" or "Plan for a Corpus Catholicorum" 

The Corpus Reformatorum was founded through the efforts of German scholar and theologian Karl Gottlieb Bretschneider who began planning for it sometime after 1827.