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national epic

n. An epic poem or similar work which seeks or is believed to capture and express the essence or spirit of a particular nation.

Wikipedia
National epic

A national epic is an epic poem or a literary work of epic scope which seeks or is believed to capture and express the essence or spirit of a particular nation; not necessarily a nation state, but at least an ethnic or linguistic group with aspirations to independence or autonomy. National epics frequently recount the origin of a nation, a part of its history, or a crucial event in the development of national identity such as other national symbols. In a broader sense, a national epic may simply be an epic in the national language which the people or government of that nation are particularly proud of. It is distinct from a pan-national epic which is taken as representative of a larger cultural or linguistic group than a nation or a nation-state.