Diplomatarium Norvegicum is a series of books containing the texts of documents and letters from Norway older than 1590, verbatim and in the original language.
The series consists of 22 volumes, containing the texts of approximately 20,000 documents.
[1] The first volume was published in 1848 at the initiative of historian Christian C. A. Lange (1810–1861), who served as the national archivist of Norway (Riksarkivar).
Some letters, particularly connected with the Church or international correspondence are in Latin.
[2] [3] Diplomatarium Norvegicum (commonly abbreviated DN) is an indispensable source for historians of Norwegian medieval history from approximately 1300.