In 1268/9, in the aftermath of the crusades against the Hohenstaufen in Italy, the papacy launched a crusade for the destruction of the Muslim colony of Lucera in northern Apulia. The article traces the events leading up to this crusade by looking at the Lucera Muslims' involvement in the struggle between the papacy and its political enemies in Italy. It investigates the way in which the Italian Muslims entered papal crusade rhetoric and describes how the crusade propaganda against them developed. At the centre of the article lies an analysis of three crusade sermons by Cardinal Eudes of Châteauroux, which he preached in support of the Lucera crusade in 1268/9 and which are the only extant evidence for the way in which the propaganda against the Lucera Muslims was conducted. This analysis shows the connections between Eudes's sermons and contemporary prophetical writings and tries to establish the psychological strategies used by Eudes to attract crusading support against the Lucera Muslims. The sermons, which have survived in a manuscript collection of Eudes's sermons now at Arras, are transcribed in an appendix at the end of the article.