Successful reconciliation between groups following a violent conflict requires psychological change. We test a model predicting intergroup attitudes towards Muslims in Lebanon among Maronite (Christian) Lebanese youths. Identification with both their religious subgroup and with the superordinate national group predicted attitudes towards Muslims, in opposite directions. These effects of levels of identification on intergroup attitudes were mediated by attributions of responsibility for the war (Muslim responsibility) and perception that the current generation of out-group members is different from the war generation (perceived out-group discontinuity). Identification with Lebanon fosters positive attitudes towards Muslims by lowering Muslim responsibility for the war, and by increasing perceptions of foreign responsibility and perceived out-group discontinuity. In contrast, increased identification with their own religious subgroup undermines attitude change by increasing Muslim responsibility for the war and lessening perception of out-group discontinuity. Representations of the past have implications for attitudes towards former enemies and reconciliation in the present.