Linked from
The 39 pages that link to Epic of Gilgamesh, each with the reason it gives.
CuneiformBroader topic: Its surviving tablets show cuneiform used for literary composition.
Epic poetryBroader topic: It is among the earliest surviving works commonly called an epic.
QuestBroader topic: Gilgamesh's failed search makes mortality itself the quest's defining object.
LiteratureBroader topic: It is among the earliest surviving works of literature in written form.
History of literatureBroader topic: It is among the earliest surviving works of extended literature.