The Crown of Aragon, made up of a sum of territories, internally cohesive and institutionally autonomous under a single sovereign and later diluted within different nation-states, has bequeathed a fragmented and dispersed memory. On this basis, the unusual entry of the armed forces into a museum in Catalonia in 2017 under court order, to seize works of art claimed by the neighbouring region of Aragon, encourages an analysis of how the material patrimony and revisionism and distortion of the history of the medieval past of the Crown of Aragon are used, in the 21st century, by the regional authorities to seek cohesion within the region by provoking clashes with the neighbouring one, so breaking bonds of institutional, social and economic collaboration maintained since the 12th century. [ABSTRACT FROM AUTHOR] more...