Explanation: "As whom the fables name of monstrous size... Created hugest that swim th'ocean stream." (Lines 197-203)

Explanation:
"As whom the fables name of monstrous size,
Related: Explanation: Thrice he assayed and thrice in spite of scorn... Words interwove with sighs found out their way (Lines 619-621)
Titanian or Earth-born, that warred on Jove,
Briaroes or Typhon, whom the den
By ancient Tarsus held, or that sea beast
Related: Explanation: He above the rest...In shape and gesture proudly eminent... Of glory obscured (Lines 589-595)
Leviathan, which God of all his works
Created hugest that swim th'ocean stream."

(Lines 197-203)

Explanation: Nor content with such... And black Gehenna called, the type of Hell (Lines 399-405)

Or,

"Him, haply, slumbering on the Norway foam,

The pilot of some small night-foundered skiff,

Deeming some island, oft, 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:"

(Lines 204-209)

Answer: These lines are taken from 'Paradise Lost' Book I of John Milton, the great epic poet in English literature.

Explanation: The chief were those who, from the pit of Hell...Their seats long after next the seat of God, Their altars by his altar. (Lines 381-384)

The poet here describes the gigantic body of Satan by means of an epic simile. He compares Satan to a Titan, who, according to fables, was of monstrous size and the child of Earth. Extending the simile further Milton says that Leviathan which in the Bible signifies sometimes a great snake, sometimes a dragon and sometimes a crocodile, was identified with the whale by most seventeenth-century Bibles. According to many legends, the slumbering Leviathan on the foamy Norwegian sea is mistaken for an island by the pilots of benighted boats. They fix the anchor on the Leviathan's hard scales and tie their boats under the impression that they are on a safe island for the night and will resume their voyage when the day breaks. Deceived as they are, the morning does not arrive according to their expectation and seems to be over-delayed.

In this epic simile used by Milton in the Homeric tradition, the poet appropriately compares Satan to the Leviathan. The point of comparison is both their gigantic size and their deceptive nature.