REGINO of Prüm. - Born at Altripp (Rhenish Prussia), he entered the Benedictine monastery of Prüm (diocese of Trier), where he was promoted abbot (892); but, driven out by Counts Gerard and Matfred, he emigrated to Trier, to the monastery of S. Martin (899) and ended his days at S. Maximin (915). He devoted himself to canon law, sacred music, and history.
His most famous work: *De synodalibus causis et disciplinis ecclesiasticis*, written c. 900, is a guide for bishops on canonical visitation. The first book sets out the method of interrogating the clergy as witnesses to parochial life; the second is an interrogation of the laity, where the canonical texts, collected as proof of the exposition of the subject, form a very valuable collection and instruct especially on the history of the Sacraments. The edition by F. G. A. Wasserschleben (Leipzig 1840) is the only one to contain the authentic text. He also wrote: *Epistola de harmonica institutione* (in M. Gerbert, *Script. eccles. de musica sacra*, II, St. Blasien 1784, p. 230); *Tonarius*, an antiphonary (in E. de Coussemaker, *Script. de musica mediæ aevi*, II, Paris 1863, pp. 1-73); *Chronicon*, from the beginning of the Christian era to 906, divided into two parts: *De temporibus Dominicæ incarnationis* and *De gestis regum Francorum* (7-11-906); from 8-9-906 the author is original (the best edition is that of Fr. Kurze, Hanover 1861, in MGH, *Scriptores rerum German. in usum schol.*, L).