Aarne–Thompson–Uther Index

Lore & Background

Antti Aarne, a student of Julius Krohn and his son Kaarle Krohn, developed the historic-geographic method of comparative folkloristics and created the initial version of the index, published in 1910 as Verzeichnis der Märchentypen. The system was based on identifying motifs and repeated narrative ideas, with its scope initially European. American folklorist Stith Thompson revised and expanded Aarne's classification in 1928, translating it into English, with the standard AT numbering system solidified in the 1961 edition (often abbreviated as 'AaTh'). German folklorist Hans-Jörg Uther updated and expanded the system in 2004, creating the Aarne–Thompson–Uther (ATU) classification system, including more tales

Reader's Guide

The Aarne–Thompson–Uther Index is a foundational reference for comparative folklore studies, providing a systematic numbering of tale types that allows scholars to identify and compare folktales across cultures. It divides tales into sections with an AT number for each entry, with subtypes designated by letters. For example, tale type 510A covers the Cinderella story, with cross-references to motifs in Thompson's Motif-Index. The index has been criticized by folklorists such as V. Propp for ignoring the functions of motifs and for uneven geographic distribution, with Eastern and Southern European tales under-represented. Despite these criticisms, it remains a keystone for the comparative method in folkloristics. The 2004 revision by Uther addressed some shortcomings, including cursory descriptions and neglect of older written versions, but the index continues to be supplemented by regional or national classification systems for tales not listed internationally.

Did You Know?

• The index was originally published in German by Finnish folklorist Antti Aarne in 1910.
• Stith Thompson's 1928 revision created the AT number system, also called the AaTh system.
• The 2004 revision by Hans-Jörg Uther added more tales from eastern and southern Europe.
• The index is used alongside the Thompson Motif-Index of Folk-Literature.

From Hahn to Aarne: The Long Road to a Universal Catalogue

Before the ATU Index reached its current form, several scholars laid essential groundwork. In 1864, Austrian consul Johann Georg von Hahn attached a preliminary list of roughly forty tale formulae to his collection of Greek and Albanian folktales. Two years later, Reverend Sabine Baring-Gould translated that list into English and stretched it to fifty-two entries, which he labeled story radicals. Folklorist J. Jacobs pushed the count further to seventy types, publishing the expanded version as an appendix in Burne and Gomme's Handbook of Folk-Lore. Meanwhile, in the Scandinavian sphere, Astrid Lunding rendered Svend Grundtvig's classification into a catalogue of one hundred thirty-four types, drawing on Danish compilations alongside international collections from the Brothers Grimm and Emmanuel Cosquin. All of this fed into the work of Antti Aarne, a student of Julius and Kaarle Krohn, who in 1910 published Verzeichnis der Märchentypen in German. His system, rooted in the historic-geographic method he helped develop, identified recurring motifs and narrative building-blocks across European storytelling and set the stage for everything that followed.

Thompson's English-Language Expansion and the AT Number System

When American folklorist Stith Thompson took up Aarne's German catalogue in 1928, he did far more than translate it. He enlarged the scope of the classification, adding new tale types and reshaping the structure so that scholars working in English could engage with the system directly. This edition introduced what became known as the AT number system, also called the AaTh system, a numbering convention that remained the standard reference through the latter half of the twentieth century. A second, further revised Thompson edition appeared in 1961. The cumulative effect of Thompson's work was substantial: as American folklorist D.L. Ashliman observed, the Aarne-Thompson system catalogued roughly two thousand five hundred basic plots from which European and Near Eastern storytellers had built their tales across countless generations. The AT numbers became inseparable from the field, used alongside Thompson's own 1932 Motif-Index of Folk-Literature as the two indispensable tools for anyone cataloguing or comparing traditional narratives.

Uther's 2004 Reimagining: A Truly International Index

By the early twenty-first century, the Aarne-Thompson system carried accumulated weaknesses. German folklorist Hans-Jörg Uther, in his 2004 publication The Types of International Folktales: A Classification and Bibliography, identified several persistent problems. Many earlier descriptions were cursory or imprecise. So-called irregular types turned out to be old and widespread rather than anomalies. And the field's heavy emphasis on oral tradition had obscured older written versions of the same tale types. Uther addressed each of these gaps. He broadened the catalogue to include more tales from eastern and southern Europe, incorporated smaller narrative forms that had previously been excluded, and shifted the collection's emphasis more explicitly toward international folktales. He also removed examples whose attestation was limited to a single ethnic group, ensuring the index reflected genuinely cross-cultural patterns. The result was the Aarne-Thompson-Uther classification, a more rigorous and geographically inclusive framework that replaced the older AT system as the reference standard in folklore studies.

How the Index Actually Works: Numbers, Subtypes, and the Cinderella Entry

The ATU Index organizes folktales into numbered sections, each entry carrying an AT number that serves as a universal shorthand. The name attached to a type is typical but flexible; the same number may be called by its central motif or by a well-known variant, and the label need not be strictly literal. Type 545B, for instance, is called The Cat as Helper yet also covers tales in which a fox assists the hero. Closely related tales are grouped together: types 400 through 424 all feature brides or wives as primary protagonists. Subtypes are marked by appending a letter to the number. Type 510, originally Persecuted Heroine, was renamed in Uther's revision to Cinderella and Peau d'Âne, with subtype 510A covering Cinderella and 510B covering Catskin, renamed Peau d'Asne. The entry for 510A spells out the full narrative arc, from the stepmother's cruelty and supernatural aid to the lost shoe and the stepsisters' mutilation, while cross-referencing specific motifs from Thompson's Motif-Index in square brackets and listing combinations with other types. Each entry closes with an extensive bibliography of secondary literature and known variants.