once attributed to him; and it is exceedingly doubtful whether the Dicta Alani de lapide philosophico really issued from his pen. On the other hand, it now seems practically demonstrated that Alain de Lille was the author of the Ars catholicae fidei and the treatise Contra haereticos. In his sermons on capital sins, Alain argued that sodomy and homicide are the most serious sins, since they call forth the wrath of God, which led to the destruction of Sodom and Gomorrah. His chief work on penance, the Liber poenitenitalis dedicated to Henry de Sully, exercised great influence on the many manuals of penance produced as a result of the Fourth Lateran Council. Alain's identification of the sins against nature included bestiality, masturbation, oral and anal intercourse, incest, adultery and rape. In addition to his battle against moral decay, Alan wrote a work against Islam, Judaism and Christian heretics dedicated to William VIII of Montpellier. List of known works Anticlaudianus Rhythmus de Incarnatione et de Septem Artibus De Miseria Mundi Quaestiones Alani Textes Summa Quoniam Homines Regulae Theologicae Hierarchia Alani De Fide Catholica: Contra Haereticos, Valdenses, Iudaeos et Paganos De Virtutibus, de Vitiis, de Donis Spiritus Sancti Liber Parabolarum Distinctiones Dictionum Theologicalium Elucidatio in Cantica Canticorum Glosatura super Cantica Expositio of the Pater Noster Expositiones of the Nicene and Apostolic Creeds Expositio Prosae de Angelis Quod non-est celebrandum bis in die Liber Poenitentialis De Sex Alis Cherubim Ars Praedicandi Sermones References Attribution: Translations Alan of Lille, A Concise Explanation of the Song of Songs in Praise of the Virgin Mary, trans Denys Turner, in Denys Turner, Eros and Allegory: Medieval Exegesis of the Song of Songs, (Kalamazoo, MI: Cistercian Publications, 1995), 291–308 The Plaint of Nature, translated by James J Sheridan, (Toronto: Pontifical Institute of Mediaeval Studies, 1980) Anticlaudian: Prologue, Argument and Nine Books, edited by W. H. Cornog, (Philadelphia, 1935) Further reading Alain de Lille: De planctu Naturae, ed. Nikolaus M. Häring, Studi Medievali 19 (1978), 797–879. Latin edition of the De planctu Naturae. Dynes, Wayne R. 'Alan of Lille.' in Encyclopedia of Homosexuality, Garland Publishing, 1990. p. 32. Alanus de insulis, Anticlaudianus, a c. di . M. Sannelli, La Finestra editrice, Lavis, 2004. Evans, G. R. (1983), Alan of Lille: The Frontiers of Theology in the Later Twelfth Century, Cambridge: Cambridge. . External links (Latin) Alanus ab Insulis, Anticlaudianus sive De officiis viri boni et perfecti (Latin) [http://www.thelatinlibrary.com/alanus/alanus1.html Alanus