Prose
The word "prose" first appears in English in the 14th century. It is derived from the Old French "prose", which in turn originates in the Latin expression "prosa oratio" (literally, straightforward or direct speech).
Icelandic literature
There has been some discussion on the probable etymology of the term “Edda”. Most say it stems from the Old Norse term "edda", which means great-grandmother, but some see a reference to Oddi, a place where Snorri Sturluson (the writer of the "Prose Edda") was brought up.
The "Elder Edda" or "Poetic Edda" (originally attributed to Sæmundr fróði, although this is now rejected by modern scholars) is a collection of Old Norse poems and stories originated in the late 10th century.