The Ormulum or Orrmulum is a 12th-century work of Biblical exegesis, written in early Middle English verse by a monk named Orm (or Ormin). Because of the unique phonetic orthography adopted by the author, the work preserves many details of English pronunciation at a time when the language was in flux after the Norman Conquest; consequently, despite its lack of literary merit, it is invaluable to philologists in tracing the development of English. Orm was concerned that priests were unable to speak the vernacular properly, and so he developed an idiosyncratic spelling system to tell his readers how to pronounce every vowel, and he composed his work using a strict poetic meter that ensured that readers would know which syllables were stressed. Modern scholars can use these two features to reconstruct Middle English just as Orm spoke it.