Organised with the assistance of an international advisory committee of medievalists, this is a standard guide to the Latin language and literature of the period from c 200 AD to 1500. It should be useful for the study of Latin texts and documents in any fields of medieval studies.
Wonderful reference work for the varieties of Medieval Latin, in terms of time/region/profession--not only vocabulary/syntax changes, but also dedicated chapters to the myriad of literary genres and practical situations (measurements, law, banking, etc.) in which Latin became its own mess. I vomited profusely as a Classical Latin dweeb (be still, ladies), but it makes sense of the changes.
If you want to "git gud" at Latin, especially if you need to master Medieval Latin for philosophy, theology, impressing the ex with foreign measurements, etc., snag a copy of this.
Although primarily a reference guide above all, this volume includes many essays (or mini-essays) that are also a joy to read through. The book is well organized, split into three major sections, each consisting of short chapters on particular facets of medieval Latinity. Most useful for reference are the extensive bibliographies appended to each chapter, which are cross-referenced throughout the volume. Also notable and commendable is the attention to electronic resources in the first part--although some of these resources (though not all) are now outdated, the movement toward and attention to electronic media reflects the general progress of Latin studies over the last few decades.
Especially useful for those who work primarily with literature (like myself) are the essays in Part III, "Varieties of Medieval Latin Literature." Jan Ziolkowski's essay "Towards a History of Medieval Latin Literature" in particular provides an intelligent, engaging introduction to the field, including historiography, fundamental issues, and continuing needs in the study of the sources. This essay establishes a solid starting point for anyone interested in pursuing Latin literature, and also points the way for many of the themes in the following chapters.
Overall, Mantello and Rigg have compiled a laudable resource for all scholars of medieval studies, and it remains a staple even after fifteen years in print.