“Samson Agonistes” is a literary work of -

Samson Agonistes, (Greek: “Samson the Athlete” or “Samson the Wrestler”) tragedy by John Milton, published in the same volume as his epic Paradise Regained in 1671.
It is considered the greatest English drama based on the Greek model and is known as a closet tragedy (one more suited for reading than performance).

John Milton is called Epic Poet. He is also called 'A great master of verse in the Puritan Period'.
His famous epics are Paradise Lost and Paradise Regained.

Source: Britannica.com