Alain de Lille has often been confounded with other persons named Alain, in particular with another Alanus (Alain, bishop of Auxerre), Alan, abbot of Tewkesbury, Alain de Podio, etc. Certain facts of their lives have been attributed to him, as well as some of their works: thus the "Life of St Bernard" should be ascribed to Alain of Auxerre and the "Commentary upon Merlin" to Alan of Tewkesbury. Alan of Lille was not the author of a "Memoriale rerum difficilium", published under his name, nor of "Moralium dogma philosophorum", nor of the satirical "Apocalypse of Golias" 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".