Three metres are commonly distinguished in Eddaic poetry: the epic measure, the speech measure, and the song measure. Most narrative poems are in the first measure, which consists of short lines of two beats joined in pairs by alliteration. The number of weakly stressed syllables might vary, but the total number of syllables in the line is rarely fewer than four. In these respects it resembles the measure used by Anglo-Saxon and early Germanic poets. The speech measure used in the Atlamál (“Words of Atli”) differs little from the epic measure, though its lines usually have a greater number of weakly stressed syllables. The song measure is the most irregular of the Eddaic verse forms. It is chiefly in didactic poems and generally consists of strophes of six lines divided into half strophes of three lines.

Skaldic verse

Norwegians and Icelanders of the 9th to the 13th century also composed skaldic poetry (from the Icelandic word skáld, “poet”). It was not composed in the free variable metres of the Poetic Edda but was strictly syllabic: every syllable had to be counted, and every line had to end in a given form. Like Eddaic lines, the skaldic lines were joined in pairs by alliteration, often using internal rhyme or consonance, but this poetry differed in syntax and choice of expression. Word order is freer than in Eddaic poetry. A highly specialized poetic vocabulary employed periphrases, or kennings, of such complexity that the poetry resembles riddles: the phrase sword liquid, for example, might stand in for blood, while the horse of the land of Haki refers to a ship (the “land” of Haki, a sea king, being the ocean). Little is known about skaldic verse forms, but they are thought to have been developed in Norway during the 9th century and could have been influenced by the forms and diction of Irish poets of the period. The earliest known poet was Bragi the Old, who probably wrote in Norway in the latter half of the 9th century. Harald I (died c. 940) of Norway was eulogized by several poets, among them Þórbjǫrn Hornklofi, whose poem the Haraldskvæði (“Lay of Harald”) was partly Eddaic and partly skaldic in style.

The distinction between Icelandic and Norwegian literature at this period can be difficult to make. Skaldic verse seems to have originated in Norway and to have been developed by Icelandic poets who, like Egill Skallagrímsson, spent much time in Norway or who wrote in praise of Norwegian kings, as did Sigvatr, counselor and court poet of Olaf II of Norway. Although the complexity of skaldic poetry has limited its modern readership, the orally transmitted poems of the 10th and 11th centuries became valuable sources for Icelandic historians in the following centuries.

Prose

Iceland’s adoption of Christianity in 1000 opened the way for powerful influences from western Europe. Missionaries taught Icelanders the Latin alphabet, and they soon began to study in the great schools of Europe. One of the first was Ísleifr, who, after being educated and ordained a priest, was consecrated bishop. His school at Skálholt in southern Iceland was for many centuries the chief bishopric and a main centre of learning. The earliest remembered historian is Sæmundr the Wise, but Ari Þorgilsson is regarded as the father of historiography in the vernacular. A short history, Īslendingabók (or Libellus Islandorum, c. 1125; The Book of the Icelanders), and the more detailed Landnámabók (“Book of Settlements”) are associated with his name. Extant works of the period are few or anonymous. Annals of contemporary events date from the 13th century and the oldest religious manuscripts, consisting of homilies and saints’ lives, from c. 1150. Larger collections of religious literature appeared in late 12th- and early 13th-century manuscripts. As elsewhere in Europe, the most popular books were often lives of the Apostles and saints.

The sagas

The word saga is used in Icelandic for any kind of story or history, whether written or oral. In English it is typically used to refer more precisely to the biographies of a hero or group of heroes written in Iceland between the12th and the 15th century. These heroes were most often kings of Norway, early founders of Iceland, or legendary Germanic figures of the 4th to the 8th century. The oldest saga is the fragmentary Ólafs saga helga (“Saga of St. Olaf”), written about 1180. In form it is a hagiographic narrative, laying emphasis on miracles worked through the agency of the saint. It was probably written in the monastery of Þingeyrar, which played an important part in cultural life in the late 12th and early 13th centuries.

Several sagas about King Olaf I Tryggvason, at whose instigation the Icelanders adopted Christianity, were also written at Þingeyrar, where the work of the monks was fanciful rather than realistic. A more critical style of history was established in the south by Sæmundr and Ari, and several notable works were written at Skálholt or nearby in the 13th century, such as the Hungrvaka (“The Appetizer”), a short history of the bishops of Skálholt from Ísleifr to Kloengr. In the late 12th century several short histories of Norwegian kings were taken from Norway to Iceland, where they influenced Icelandic historians. The Ágriþ, a summary of the histories, or sagas, of Norwegian kings, written in the vernacular in Norway, was particularly influential. The Fagrskinna (“Fine Skin”; Eng. trans. Fagrskinna) covered the same period in more detail, while the Morkinskinna (“Rotten Skin”; Eng. trans. Morkinskinna), probably written earlier, covered the period from Magnus I Olafsson (ruled 1035–47) to the late 12th century.

Snorri Sturluson wrote many kinds of works and played an important role in political wrangles in his time. Among works ascribed to him are the Snorra Edda (c. 1225), a handbook of prosody and poetic diction commonly referred to as the Prose Edda, or Younger Edda. He twice visited Norway, and a large part of his work consists of lives of its early kings: he combined his Ólafs saga with lives of other Norwegian kings to form the Heimskringla (c. 1220; “Orb of the World”; Eng. trans. Heimskringla). The value of these as historical sources has long been debated. Snorri was certainly well read in vernacular history and attempted to write faithful accounts of what he had read in earlier records. But he did not aim to write history in the modern sense of the term, as an analytical reconstruction of past events; his work was creative and therefore portrayed his heroes imaginatively. The stirring Egils saga (on the skald Egill Skallagrímsson) is attributed to Snorri.