Grega saga is an Old Norse chivalric saga known only from a manuscript that survives as a single leaf: AM 567 XXVI 4to.
[1][2] As it has no known exemplar, it is considered to be an original Old Norse composition.
The saga uses motifs found in Ívens saga and Þiðreks saga: a grateful lion becomes Grega's companion and kills three giants.
[3] The leaf was written by Magnús Þórhallsson, who worked on Flateyjarbók with Jón Þórðarson [Wikidata].
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