These are, on the whole, the most generally valuable of contemporary sources. The two most important for the period dealt with in this book are: Nicholas Eymeric, _Directorium Inquisitorum cum commentariis F. Pegnae_ (Rome, 1585; also Venice, 1607). Bernard Gui, _Practica Inquisitionis haereticae pravitatis_ (ed. C. Douais, Paris, 1886). Eymeric was inquisitor in Aragon in the latter half of the fourteenth century. His compendious work is probably the most authoritative of all inquisitorial treatises, being a complete exposition of the principles of the tribunal and the doctrines of the different sects with which it had to deal, and giving the minutest details of its procedure. Bernard Gui, appointed inquisitor at Toulouse in 1306, was the most vigorous and remarkable of those who helped to stamp out Catharism in Languedoc after the Albigensian crusades. The following treatises are not contemporary, but they are valuable as expositions of the permanent principles and methods of the tribunal. They are also useful for the occasional comments made by these later experts on the work of their predecessors: J. Simancas, _De Catholicis Institutionibus_. A. Bzovius, _Historiae Ecclesiasticae_. J. à Royas, _De Haereticis_. Bernard of Como, _Lucerna Inquisitorum haereticae pravitatis_. Arnaldo Albertini, _Tractatus de agnoscendis assertionibus Catholicis et haereticis_. Zanchino Ugolini, _De Haereticis_. All these, among other similar tracts, are included in Zilettus, _Tractatus Universi Juris_ (Venice, 1633), vol. xi, pt. ii. See also Ludovico à Paramo, _De origine et progressu officii Sanctae Inquisitionis_ (Madrid, 1598). Umberto Locati, _Opus judiciale inquisitorum_ (Rome, 1572). F. Peña, _Inquirendorum haereticorum lucerna_ (Madrid, 1598). Carena, _Tractatus de officio Sanctae Inquisitionis_ (Lyons, 1669). II COLLECTIONS OF ORIGINAL DOCUMENTS There are records of the proceedings and sentences pronounced in the Inquisitions in the South of France in _Liber sententiarum Inquisitionis Tholosanae_, 1307-13, printed as an appendix to Philippe à Limborch, _Historia Inquisitionis_ (Amsterdam, 1692). Note that this _Liber sententiarum_ is not included in Chandler’s English translation of Limborch. These are the sentences pronounced by Bernard Gui. The proceedings of the Inquisition of Carcassonne, notably the sentences of Bernard de Caux, are contained in _Documents pour servir à l’histoire de l’Inquisition dans le Languedoc_ (ed. C. Douais, Paris, 1900). There are exceedingly useful extracts from original documents of various sorts relating to mediæval heresies in the following: J. J. Döllinger, _Beiträge zur Sektensgeschichte_ (Munich, 1890), vol. ii. P. Frédéricq, _Corpus documentorum Inquisitionis haereticae pravitatis Nederlandicae_ (Ghent, 1889-1906), vols., i-iii. For the edicts of ecclesiastical Councils the best collection is: