structural:expansion, linguistic:translation
Versions

Distinct sources exist from over a 2000-year timeframe. The earliest Sumerian poems are now generally considered to be distinct stories, rather than parts of a single epic. Some of these may date back to as early as the Third Dynasty of Ur (c. 2100 BC). The Old Babylonian tablets (c. 1800 BC) are the earliest surviving tablets for a single Epic of Gilgamesh narrative. The older Old Babylonian tablets and later Akkadian version are important sources for modern translations, with the earlier texts mainly used to fill in gaps (lacunae) in the later texts. Although several revised versions based on new discoveries have been published, the epic remains incomplete. Analysis of the Old Babylonian text has been used to reconstruct possible earlier forms of the epic. The most recent Akkadian version, also referred to as the Standard Babylonian version, consists of twelve tablets and was edited by Sîn-lēqi-unninni, who is thought to have lived sometime between 1300 BC and 1000 BC.

From the diverse sources found, two main versions of the epic have been partially reconstructed: the Standard Babylonian version, or He who saw the deep, and the Old Babylonian version, or Surpassing all other kings. Five earlier Sumerian poems about Gilgamesh have been partially recovered, some with primitive versions of specific episodes in the Babylonian version, others with unrelated stories.