Byron's poem was written during the Romantic period. During this period, several events occurred which resembled (to some) the biblical signs of the apocalypse. Many authors at the time saw themselves as prophets with a duty to warn others about their impending doom. However, at the same time period, many were questioning their faith in a loving God, due to recent fossil discoveries revealing records of the deaths of entire species buried in the earth.
1816, the year in which the poem was written, was called "the year without summer", as strange weather and an inexplicable darkness caused record-cold temperatures across Europe, especially in Geneva where Byron claimed to have received his inspiration for the poem, saying he "wrote it... at Geneva, when there was a celebrated dark day, on which the fowls went to roost at noon, and the candles were lighted as at midnight". The darkness was (unknown to those of the time) caused by the volcanic ash spewing from the eruption of Mount Tambora in Indonesia (Vail 184). The search for a cause of the strange changes in the light of day only grew as scientists discovered sunspots on the sun so large that they could be seen with the naked eye. Newspapers such as the London Chronicle reported on the panic:
The large spots which may now be seen upon the sun's disk have given rise to ridiculous apprehensions and absurd predictions. These spots are said to be the cause of the remarkable and wet weather we have had this Summer; and the increase of these spots is represented to announce a general removal of heat from the globe, the extinction of nature, and the end of the world.A scientist in Italy even predicted that the sun would go out on July 18, shortly before Byron's writing of "Darkness". His "prophecy" caused riots, suicides, and religious fervor all over Europe. For example:
"A Bath girl woke her aunt and shouted at her that the world was ending, and the woman promptly plunged into a coma. In Liege, a huge cloud in the shape of a mountain hovered over the town, causing alarm among the "old women" who expected the end of the world on the eighteenth. In Ghent, a regiment of cavalry passing through the town during a thunderstorm blew their trumpets, causing "three-fourths of the inhabitants" to rush forth and throw themselves on their knees in the streets, thinking they had heard the seventh trumpet.
This prediction, and the strange behavior of nature at this time, stood in direct contrast with many of the feelings of the age. William Wordsworth, for example, a famous poet of the time, often expresses in his writing a belief in the connection of God and nature for which much of the Romantic Era's poetry is typical. His "Tintern Abbey", for example, says "Nature never did betray / The heart that loved her". His poetry also carries the idea that nature is a kind thing, living in peaceful co-existence with man. He says in the same poem, referring to nature, that "all which we behold / is full of blessings. In other poems, such as "I Wandered Lonely as a Cloud", he uses language for flowers and clouds that is commonly used for heavenly hosts of angels. Even the more frightening Gothic poems of Coleridge, another famous poet of the time, argue for a kind treatment of nature that is only cruel if treated cruelly, as in "Rime of the Ancient Mariner", unlike Byron's sun, which goes out with no human mistreatment mentioned at all.
Byron's pessimistic views continue, as he mixes Biblical language with the apparent realities of science at the time. As Paley points out, it is not so much significant that Byron uses Biblical passages as that he deviates from them to make a point. For example, the thousand-year peace mentioned in the book of Revelation as coming after all the horror of the apocalypse does not exist in Byron's “Darkness.” Instead, “War, which for a moment was no more, / Did glut himself again.” In other words, swords are only beaten temporarily into plowshares, only to become swords of war once again. Also, the fact that the vipers are “stingless” parallels the Biblical image of the peace to follow destruction: “And the sucking child shall play in the whole of the asp.” In the poem, though, the snake is rendered harmless, but the humans take advantage of this and the vipers are “slain for food.” Paley continues, saying “associations of millennial imagery are consistently invoked in order to be bitterly frustrated.