The Epic of Gilgamesh (Penguin Epics) by N. K. Sandars

A great king, strong as the stars in Heaven. Enkidu, a wild and mighty hero, is created by the gods to challenge the arrogant King Gilgamesh. But instead of killing each other, the two become friends. Travelling together to the Cedar Forest, they fight and slay the evil monster Humbaba. But when Enkidu is killed, his death haunts and breaks the mighty Gilgamesh. Terrified of mortality, he resolves to find the secret of eternal life...