This is the first of two volumes on theological quodlibeta, records of special disputations held before Christmas and Easter circa 1230-1330, mostly at the University of Paris, in which audience members asked the great masters of theology the questions for debate, questions de quolibet, "about anything." The variety of the material and the authors ? stature make the genre uniquely fascinating. In Volume I, chapters by acknowledged experts introduce the genre, cover the quodlibeta of Thomas Aquinas, Henry of Ghent, Giles of Rome, Godfrey of Fontaines, and 13th-century Franciscans, and demonstrate how the masters used quodlibeta to construct and express their authority on issues from politics and economics to two-headed monsters. For all those interested in medieval studies, especially intellectual history.