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Origin and history

The Arces Tower, also known as the Arces Building, is the dungeon of an ancient castle built between the late 12th and early 13th centuries. It was the heart of the seigneury of the tower of Arces, whose ruins are located in the commune of Saint-Ismier in Isère. Perched at 585 metres above sea level on a rocky boulder from a landslide, it was strategically overlooking the Gresivaudan Valley and the Faita Pass in Chartreuse. Accessible by a dedicated path, it bears witness to medieval military architecture.

The first known lord, Louis, owned the castle as early as 1170. Around 1275, Guigues Morard inherited the building of Arces by family division and adopted the name of his mother, marking a seigneurial continuity. The tower, probably built by Louis d'Arces (1160–1242), changed hands in 1640 when Jean d'Arces, the last heir, sold it to Paul Aymon de Franquières. In 1794 it belonged to François Berlioz. Since 1989, the eponymous association has been working for its restoration, leading in 2020 to its donation to the commune of Saint-Ismier.

Architecturally, the quadrangular tower (8 metres side, 13.5 metres high) has 1.40 metre thick walls, with archers and rectangular or geminated windows. It was surrounded by two enclosures and a chapel dedicated to Sainte-Catherine. A turret complemented the defensive ensemble. Since 2016, restoration works have been carried out to rediscover and rehabilitate buried parts of the monument, under the impetus of the local association.

The tower illustrates the evolution of medieval fortifications in Dauphiné, moving from a military role to a preserved communal heritage. Its history reflects seigneurial dynamics, family transmissions and contemporary conservation issues. Archaeological and associative sources, such as the 2019-2020 reports, document these efforts to perpetuate this testimony of the past.

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