What kind of literary genre consist lenghty narrative poem?

The literary genre that consists of lengthy narrative poems is called an epic. Epics are long, narrative poems that typically recount the adventures and heroic deeds of a legendary or historical figure. They often involve themes of love, loss, heroism, and the struggles between good and evil. Epics are often written in a grand and elevated style, and they may employ a variety of literary devices, such as similes, metaphors, and personification. Some well-known examples of epics include Homer's Iliad and Odyssey, Virgil's Aeneid, and Dante's Divine Comedy.