The Árni Magnússon Institute for Icelandic Studies is an institute of the Ministry of Education, Science and Culture of Iceland which conducts research in Icelandic and related academic studies, in particular the Icelandic language and Icelandic literature, to disseminate knowledge in those areas, and to protect and develop the collections that it possesses or those placed in its care. It is named after Árni Magnússon, a 17th–18th century collector of medieval Icelandic manuscripts.

Codex Regius or GKS 2365 4º is an Icelandic codex in which many Old Norse poems from the Poetic Edda are preserved. Thought to have been written during the 1270s, it is made up of 45 vellum leaves. The work originally contained a further eight leaves, which are now missing. It is the sole source for most of the poems it contains. In scholarly texts, this manuscript is commonly abbreviated as [R] for Codex Regius, or as [K] for Konungsbók.