The Prose Edda
Snorri Sturluson's handbook of skaldic poetry, ca. 1220. Preserved in four principal manuscripts — Codex Upsaliensis (DG 11), Codex Regius of the Prose Edda (GKS 2367 4to), Codex Wormianus (AM 242 fol), and Codex Trajectinus.
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Prologus
Euhemeristic introduction: the gods are explained as Asian war-leaders. Contested; likely Snorri's own frame.
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Gylfaginning
King Gylfi visits the Æsir in disguise as Gangleri. Across 54 chapters the cosmogony, gods, and cosmology are laid out, through to Ragnarök and the world's rebirth.
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Skáldskaparmál
Bragi instructs Ægir in poetic language. Kennings and heiti are presented with the stories behind them (Iðunn's apples, Suttungr's mead, Baldr's death, the Song of Grotti, etc.).
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Háttatal
Snorri's own skaldic poem in 102 stanzas, each illustrating a distinct verse form. The poem is addressed to Hákon Hákonarson and Skúli Bárðarson, with prose commentary.