The paper analyses the context of the formation and the narrative structure of the borussianistic historical master narrative based on the myth of Prussia’s German mission. By examining the relationship between the master narrative and the culture of remembrance, the article shows how, during the period of 1871-1914, the meanings of the borussianistic historical master narrative were consolidated into public commemoration practices of East Prussia and how that consolidation changed the multiplicity of identity intrinsic to East Prussia in the first half of the 19th century. On the basis of a case study analysis (the erection of a national monument “Borussia” in Klaipeda/ Memel), the article investigates the forms of application of borussianistic historical master narrative meanings on the territory of East Prussia, inhabited by mixed Lithuanian and German population.