Question: Vala is a character that is mentioned in the world created by what English author?
Sentence (from "Har (Blake)"): Har appears in "Tiriel" (1789) and "The Song of Los" (1795) and is briefly mentioned in "The Book of Thel" (1790) and "Vala, or The Four Zoas" (1796-1803).
Relevant evidence: No