Short answers, pulled from the story.
The Sagas of Icelanders, also called family sagas or Íslendingasögur, are a group of Old Icelandic prose narratives based primarily on historical events that took place in Iceland during the ninth, tenth, and early eleventh centuries. They are the best-known specimens of Icelandic literature and are valued as unique sources on medieval Scandinavian societies, pre-Christian religion, and the heroic age.
Most of the Sagas of Icelanders were recorded in the thirteenth and fourteenth centuries, well after the events they describe. The authors or recorders of these sagas are largely unknown.
Some scholars believe Egil's Saga was written by Snorri Sturluson, a descendant of the saga's hero, but this attribution remains uncertain.
The standard modern edition of the Icelandic sagas is produced by Hið íslenzka fornritafélag, known as Íslenzk fornrit, which translates as the Old Icelandic Text Society.
The Sagas of Icelanders were written in Old Icelandic, a western dialect of Old Norse, primarily on calfskin.
Sigurður Nordal's work Sagalitteraturen divides the sagas into five chronological groups based on when they were written, ranging from 1200-1230 through to the fourteenth century. This framework has been criticized for its assumed attitude toward the fantastic and its overestimation of the authority of Landnámabók.