Codex Germaniae diplomaticus, worinnen viele ... zur Illustration der Teutschen Reichs-Historie und Juris Publici, höchstnöthige Documenta enthalten sind, welche ... weiter in dem Teutschen Reichs-Archiv, noch dessen Continuationen und Spicilegiis zu befi: (nebst Elenchis und einem Haupt-Register)

The Codex Germaniae diplomaticus was compiled by Johann Christian Lünig during the early 18th century as a monumental reference work for scholars of German imperial history and public law. Emerging from the tradition of German historical jurisprudence, the collection was intended to provide researchers with direct access to critical diplomatic documents that were otherwise scattered across various archives or difficult to verify through existing legal commentaries.

Lünig designed the work to serve as a supplemental pillar to the existing Teutschen Reichs-Archiv, filling gaps in documentation that previous historiographical efforts had failed to address. By systematically gathering and indexing these records, Lünig aimed to create an authoritative corpus that would facilitate rigorous analysis of the Holy Roman Empire’s legal frameworks. His methodical approach to categorization and his inclusion of extensive indices earned the work lasting recognition among academic historians as a foundational instrument for studying pre-modern German constitutional and administrative history.