The term "
Edda" (;
Old Norse Edda, plural
Eddur) applies to the
Old Norse Prose Edda and has been adapted to fit the collection of poems known as the
Poetic Edda which lacks an original title. Both works were written down in
Iceland during the 13th century in Icelandic, although they contain material from earlier traditional sources, reaching into the
Viking Age. The books are the main sources of medieval
skaldic tradition in Iceland and
Norse mythology.