semantically, it is unlikely that "Edda" could have been coined in the 13th century on the basis of "óðr", because such a development "would have had to have taken place gradually", and Edda in the sense of 'poetics' is not likely to have existed in the preliterary period. Edda also means 'great-grandparent', a word that appears in Skáldskaparmál, which occurs as the name of a figure in the eddic poem Rigsthula and in other medieval texts. A final hypothesis is derived from the Latin edo, meaning "I write". It relies on the fact that the word "kredda" (meaning "belief") is certified and comes from the Latin "credo", meaning 'I believe'. Edda in this case could be translated as "Poetic Art". This is the meaning that the word was then given in the medieval period. The now uncommonly used name Sæmundar Edda was given by the Bishop Brynjólfur Sveinsson to the collection of poems contained in the Codex Regius, many of which are quoted by Snorri. Brynjólfur, along with many others of his time incorrectly believed that they were collected by Sæmundr fróði (therefore before the drafting of the Edda of Snorri), and so the Poetic Edda is also known as the Elder Edda. Manuscripts Seven manuscripts of the Prose Edda have survived into the present day: Six copies from the medieval period and another dating to the 1600s. No one manuscript is complete, and each has variations. In addition to three fragments, the four main manuscripts are Codex Regius, Codex Wormianus, Codex Trajectinus, and the Codex Upsaliensis: The other three manuscripts are AM 748; AM 757 a 4to; and AM 738 II 4to, AM le ß fol. Although some scholars have doubted whether a sound stemma of the manuscripts can be created, due to the possibility of scribes drawing on multiple exemplars or from memory, recent work has found that the main sources of each manuscript can be fairly readily ascertained. The Prose Edda''' remained fairly unknown outside of Iceland until the publication of the Edda Islandorum in 1665. Authorship The text is often assumed to have been written or at least compiled to some extent by Snorri Sturluson. This identification is largely based on the following paragraph from a portion of Codex Upsaliensis, an early 14th-century manuscript containing the Edda: Scholars have noted that this attribution, along with that of other primary manuscripts, is not clear whether or not