Axel Olrik

While a student, Olrik soon came under the influence of Svend Grundtvig, and until the latter's death in 1883, was treated almost like a son. His first major scholarly work was therefore a continuation of Grundtvig's work on the Danish ballads; with Danske Ridderviser (1898–1919) he continued the publication of Danmarks gamle Folkeviser, which was in turn continued after his own death by his pupil Hakon Grüner-Nielsen.[1][4] Olrik was able to draw more than Grundtvig on collected oral material; in 1888–89 he himself did some fieldwork collecting folksongs.[1]

Grundtvig had amalgamated what he considered useful features from various versions of a folksong or ballad to produce a long, complex whole; Olrik, in contrast, sought to trace the history of the oral texts back to simple originals. He published several sample studies in Danske Studier, the journal he co-founded with Marius Kristensen in 1904, and in 1899–1909, with Ida Falbe-Hansen, he published a collection of reconstructed texts, Danske Folkeviser i Udvalg; in 1899–1904, an edition with melodic arrangements by Thomas Laub was published. These were very popular and were translated into German and English.[1]

In addition to Danske Studier, Olrik together with Henning Frederik Feilberg and H. O. Lange founded the Danish folklore archive (Dansk Folkemindesamling),[5] and served as its first president. He was also the first president of Danmarks Folkeminder, an association founded in 1908, and set up its committees for the study of folklore material and of placenames, both of which are now research institutes at the University of Copenhagen. In addition, with Kaarle Krohn and C. W. von Sydow, he co-founded the international organisation of Folklore Fellows in 1907,[6][7][8] and the first issue of Folklore Fellows' Communications, of which he was co-editor from its inception in 1910,[4] consists of an account by him of the Danish folklore archive.[1][9][10] Upon his death, his professorship and with it folklore studies at the University of Copenhagen came to an end; the field was only revived in 1961.

Olrik's Ph.D. dissertation, Forsøg på en tvedeling af kilderne til Sakses oldhistorie ("Attempts at a two-part division of the sources for Saxo's history of the Danes"), was on the sources of Saxo Grammaticus' Latin history of the Danes, Gesta Danorum. Based on the presence or absence of West Norse names and familiarity with West Norse geography and with material in pre-existing Icelandic historical works, he believed it was possible to distinguish passages in which Saxo had drawn on Norwegian and Icelandic sources and those where he had used native Danish traditions.[1][4] This work led him to the view that the religious, heroic and historical traditions of the different Scandinavian peoples had already diverged by the Viking Age, and he sought to trace the origins, development and regional variation of individual works and concepts.[1] He published many articles on Scandinavian religion, onomastics, and related subjects, including an interpretation of the images on the Golden Horns of Gallehus which was published in 1918, after his death,[4] studies of Ragnarök, and a book on Scandinavian paganism in the Viking Age, Nordisk Åndsliv i Vikingetid og tidlig Middelalder, all of which were revised and completed by his student Hans Ellekilde and published in 1926 and 1951 as Nordens Gudeverden.[1]

Olrik eventually developed a system for the study of oral narrative (which he called sagn - 'saga'), including principles for the study of sources (developed with Kristian Erslev), a theory of transmission and most influentially, a theory of form which he called "epic laws".[1] This was based on an idea of Moltke Moe's, but Olrik's approach is structural whereas Moe sought to derive rules for the historical development of narratives.[3] His unfinished work on the study of oral narrative was published posthumously in 1921 by Ellekilde as Nogle grundsætninger for sagnforskning.