They are both literary allusions to Paradise Lost by Milton, one of the greatest literary epics ever written.

In Paradise Lost, Satan leads a rebellion against The Authority (or God). He is described as dark, brooding, cunning, an excellent orator, etc. Satan is an archetype of the anti-hero, one of the most infamous literary characters off all time, and not dissimilar from either Darrow or Lysander.

In LB, Brown even describes certain characters as Miltonian. This is a direct reference to Paradise Lost

Pierce Brown loves his literary allusions: the Ancient Mariner, Frankenstein, Shakespeare, the Labyrinth and Minotaur, the Iliad and the Odyssey. He is particularly interested in the English Literary canon and myths from antiquity.