Milton in his Paradise Lost, printed in 1667, comparing Satan with huge monsters, mentions the sea-serpent of the Norwegians, calling it Leviathan (Book I, verse 192-208):

"Thus Satan, talking to his nearest mate,
With head up-lift above the wave, and eyes
That sparkling blazed; his other parts besides
Prone on the flood, extended long and large,
Lay floating many a rood, in bulk as huge
As whom the fables name of monstrous size
Titanian, or Earth-born, that warred on Jove,
Briareus, or Typhon, whom the den
By ancient Tarsus held; or that sea-beast
Leviathan, which God of all his works
Created hugest that swim the ocean stream:
Him, haply slumbering on the Norway foam,
The pilot of some small night foundered skiff
Deeming some island, off, as seamen tell,
With fixed anchor in his scaly rind,
Moors by his side under the lee, while night;
Invests the sea, and wished morn delays."

He mixes here also another story of a large sea-monster on which sea-men, believing it some island, will anchor, a story told about the Kraken and about the sperm-whales.