Important texts for the reconstruction of the evolution of Middle English out of Old English are the Peterborough Chronicle, which continued to be compiled up to 1154; the Ormulum, a biblical commentary probably composed in Lincolnshire in the second half of the 12th century, incorporating a unique phonetic spelling system; and the Ancrene Wisse and the Katherine Group, religious texts written for anchoresses, apparently in the West Midlands in the early 13th century.[14] The language found in the last two works is sometimes called the AB language.