Fictional King of Morocco is mythical figure of Biblical proportions, herald of Apocalypse, usually associated with prophetical songs of Tolerance Sectarians from eastern Bohemia. Presented article deals with the motif of King of Morocco in these songs and tries to analyze its origin. Various sources of this oral tradition are discussed, like great influence of Protestant political prophecies, heterodox prophecies and folklore narratives of the period. The character of King of Morocco represents an affiliated motif to a specific corpus of oral traditions, consisting of apocalyptical narrative pattern about the Judgment Day. Origin of the motif of King of Morocco remains obscure; however, the popular reception of diplomatic visit of envoy of Sultan of Morocco to Vienna in 1783, combined with misinterpreted news about Tolerance Decree, seems to be the most probable source. Although associated with oral culture of Tolerance Sectarians, the whole narrative pattern was disseminated more widely and lived on in Czech oral tradition at least until 1848.