Amongst the Iron Age Scandinavian elite, there are several supra-regional and multifaceted tripartite (or threefold) symbolic expressions. These include expressions found in art, artefacts and monuments, such as the triangular stone-settings, or Sw. treuddar, which may be the strongest manifestation in the landscape. In addition, tripartite symbolism is found in the elite’s óðal-claims and also Norse mythological structures. Due to the widespread pervasiveness of tripartite symbology within the culture of the Iron Age elite, these phenomena are conceptualised in the theoretical framework of a ‘tripartite ideology’. This study addresses the questions of why was the tripartite ideology so enduring within the Nordic Iron Age, in what ways did it manifest and what positions did it hold in the Iron Age elite’s socio-cultural and religious thought-world? This research examines the monumental, artefactual, social and mythological manifestations of the tripartite ideology in Iron Age Scandinavia. The objective is to formulate a theory which synthesises the various expressions of tripartite symbology using a source-pluralistic methodology, which combines archaeological evidence with both emic (insider) and etic (outsider) historical sources, alongside religious studies and semiotics in order to provide a more representative picture of the function of treuddar and tripartite symbolism in the Iron Age elite milieu. The result of this methodology is that the tripartite ideology is connected with the Iron Age elite’s ancestral óðal-claims based on a legendary or divine descent, along with acting as a‘liminal locus’ whereby the Other World could be accessed.