What does it mean “to tolerate” in a post-Christian and post-secular state? This chapter argues that antecedents of contemporary conflicts over diversity in Europe can be found in early modernity, specifically in early modern practices of toleration, which impacted on both the belonging and the visibility of minorities. New forms of intolerance pertain to the position of religious, ethnoreligious, and sexual minorities in public life, echoing the concerns of the public visibility of minorities inhering in historical Christendom. The political articulation of certain groups as “other” to “the nation” is increasingly mediated through constitutional repertoires, such as constitutional revision and amendments, developments in the hermeneutics of constitutional concepts, or pseudo-constitutional behaviour. This chapter introduces the main themes: tolerance and intolerance, constitutionalism, secularisation, and their significance across the liberal–illiberal divide.