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Origin and history

The Grand Amphitheatre, located in the Vosges department, is a Gallo-Roman building built between 80 and 140 AD outside the Upper Empire rampart. Designed as a semi-amphitheater, it leans on the slopes of a valley (the rockcombe) and combines an elliptical arena of 50.80 m and partial steps to the south. Its capacity, estimated at between 16 000 and 20 000 spectators, reflects the importance of the ancient city of the Leuques, while its masonry in small apparatus, partly taken up in large apparatus in the third century, bears witness to architectural evolutions.

The building, classified as a historical monument in 1846, was originally interpreted as a mixed work (theatre and amphitheatre) because of its incomplete cellara to the north, where a straight facade with blind arches replaced the steps. The arena, surrounded by a podium and accessible by vaulted parodoi, housed sacella dedicated to Mars, Jupiter, Diane and Nemesis. Its definitive abandonment in the fourth century coincides with the decline of pagan cults, although late sources, such as the Latin Panegyrics, evoke a symbolic link with Emperor Constantine in 309, hypothesis now contested.

Archaeological excavations, initiated in the 18th century by engineers such as Le Gendre and Jollois, revealed its precarious state of conservation, used as a stone quarry by the inhabitants. Between 1963 and 1976, Édouard Salin and Roger Billoret led major campaigns, even involving military detachments, to clear the amphitheatre and its built karst network. The latter, long interpreted as a water supply system, was identified as a natural phenomenon exploited for rituals linked to "saving waters", reinforcing the hypothesis of a sanctuary dedicated to Apollo-Grannus.

The modern restoration, led by architect Michel Goutal in the 1990s, includes the laying of iroko steps to protect the gelive masonries and partially restore the capacity to welcome (4,500 places). Geophysical prospections (radar, magnetometer) confirmed the central role of an episodic resurgence in local cults. Today owned by the Vosges department, the site is part of a larger archaeological complex, including a 1,760 m enclosure and residential areas.

Ancient sources, such as Dion Cassius, mention a visit by Emperor Caracalla in 213 AD, marked by beautifications of the amphitheatre (a large apparatus to the west). However, this attribution, like that of Constantine's passage, remains debated by contemporary historians. The excavations also revealed altars dedicated to Jupiter Héliopolitain, highlighting the religious syncretisms of the site, where Roman influences and local Gaulish cults were mixed.

The monument, open to the visit, illustrates Roman ingenuity in terms of relief planning (natural slope, valley) and hydraulic management. Its ranking among the ten largest Roman amphitheatres, coupled with its turbulent history — from the first polls of the 18th century to modern geophysical techniques — makes it an exceptional witness to the Romanization in Gaul and the cultural practices associated with the sources.

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