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Heritage classified

Key figures

Origin and history

The castral motte of Saint-Omer, one of the most imposing in the region by its diameter and rare example preserved in urban areas, symbolizes the origins of the city and the progressive affirmation of political power. First residence of the chestnut, representative of the Count of Flanders, it then became the seat of the bailis of the king of France, thus marking the transition between the Comtal and the Royal authorities. Its historical importance is also due to its proximity to the neighbouring cathedral ensemble, illustrating the bipolarity of the spiritual and temporal powers that structured the city from its foundation.

In the 12th century, the site already embodied seigneurial control, before seeing its role evolve with the construction of a prison in 1762, most probably on the foundations of the old castle. This judicial building, integrated into the motte, perpetuates the memory of the political and judicial authority exercised in Saint-Omer since the Middle Ages. The present parcellar also preserves the traces of this medieval organization, where the mott and the cathedral formed two complementary poles of power, one temporal, the other spiritual.

Ranked as a Historic Monument in 2003, the castral mound and its access portal, as well as the old prison with its own portal, today bear witness to nearly a millennium of institutional history. Their preservation offers a rare example of continuity between a medieval fortress and a modern judicial infrastructure, while stressing the central role of Saint-Omer in the regional administration, from the Counts of Flanders to the Kings of France.

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