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Conflict between Gregory VII and Henry IV 295 ]&w,Bibliotheca rerum Germanicarum, Vol. II. Contains the letters of Gregory VII. There are several lives of Gregory VII (see Potthast, pp. 1350 sqq.). Among these the most important is perhaps Vita Hein- rici IV imperatoris. (Octavo edition of the Monumenta, and Geschicht- schreiber, Vol. L.) Libelli de lite imperatorum et pontificum saeculis XI et XII conscripti, 3 vols., 1891 sqq. Published in the Monumenta, and contains the pam- phlets and treatises which were called forth by the troubles between pope and emperor.
