Milton had contemplated the composition of an epic poem for many years. For his subject matter he chose the fundamentals of Christian theology. By the time he began writing Paradise Lost in the late 1650’s, Milton had become blind. He dictated the entire work to secretaries.
Paradise Lost has many of the elements that define epic form. It is a long, narrative poem; it follows the exploits of a hero (or anti-hero); it involves warfare and the supernatural; it begins in the midst of the action, with earlier crises in the story brought in later by flashback; and it expresses the ideals and traditions of a people. It has these elements in common with the Aeneid, the Iliad, and the Odyssey.