"[...] Also, the name of their Primarch, Lion El'Jonson, is inspired by the English poet Lionel Johnson, the author of "The Dark Angel". Originally the name was spelt Lyyn Elgonsen (Rogue Trader p.138); presumably to hide the reference.""Lionel Pigot Johnson (15 March 1867 - 4 October 1902) was an English poet, essayist and critic. [...] educated at Winchester College and New College, Oxford, graduating in 1890. He became a Catholic convert in 1891. He lived a rather solitary life in London, [...]
His poem, The Dark Angel served as one of the influences for the Dark Angels chapter of Space Marines in the Warhammer 40,000 fictional universe. Their Primarch, Lion El'Jonson, is also named after him.
Johnson wrote many notable homosexual poems, most of which are angry and agonized. In 1892, having converted to Catholicism and turned against his friend Oscar Wilde, Johnson directed a sonnet at him called "The Destroyer of a Soul" (presumably the soul of his cousin Lord Alfred Douglas, whom he had introduced to Wilde the previous June). In the following year, Johnson wrote what some consider his masterpiece, "The Dark Angel," rooted in anguish about his homosexuality.