Constitutional entanglements in Canada–Quebec relations are well known. From one referendum on Quebec’s sovereignty to the other, from one pan–Canadian constitutional meeting to the other, the ‘Quebec problem’ seems irresolvable. One dimension is constantly overlooked in this debate: territorial identity. Territorially–based cultural claims emerge in the core of urban Quebec under the leadership of partitionist and localist movements. Originally based in Montreal, the partitionist movement is driven by Anglo–Que´be´cois claims over local municipalities and certain parcels of the territory in the event of an independent Quebec. This paper seeks to understand a dual reterritorialisation process: 1) state territorial rescaling policies such as decentralisation and metropolitan reform, and 2) the use of territorial claims underpinning social mobilisation strategies. When state territorial restructuring policies do not correspond with the local territorial political culture, as I argue in the case of a ‘frontier–city’ like Montreal, it spurs the activation of strategic territorialisation. This paper begins with an analysis of Montreal’s territorial political culture, rooted in the coexistence of opposite territorial myths and a common feeling of distinctiveness. Then follows a discussion of strategic territorialisation and the poly–scalar nature of such mobilisation. [ABSTRACT FROM AUTHOR]