The version of "Ancrene Wisse" contained in the library of Corpus Christi College, Cambridge, is known as MS 402. It was written in an early Middle English dialect known as 'AB language' where 'A' denotes the manuscript Corpus Christi 402, and 'B' the manuscript Oxford, Bodleian Library MS Bodley 34. Manuscript Bodley 34 contains a set of texts that have become known as the "Katherine Group": Seinte Katerine, Seinte Margarete, Seinte Iuliene, Hali Meiðhad and Sawles Warde. Both manuscripts were written in the AB language, described by J. R. R. Tolkien as "a faithful transcript of some dialect...or a 'standard' language based on one' in use in the West Midlands in the 13th century." The word "Ancrene" itself still exhibits a feminine plural genitive inflection descended from the old Germanic weak noun declension; this was practically unknown by the time of Chaucer.