 An allusion to "Mr. Raven", the ghostly librarian in George MacDonald's novel "Lilith", may be intended.Matthew is the raven companion of Dream of the Endless.Matthew was originally Matthew Cable, a long-time supporting character in the "Swamp Thing" series, but because he died while asleep in the Dreaming, he was offered the chance to become a dream raven and serve Dream if he wished, and he accepted.