The Jublains archeological site is a cluster of ruins, mostly dating back to Ancient Rome, in the current French commune of Jublains in the département of Mayenne in the Pays de la Loire.
Roman imperial authorities built a city named Noviodunum on the site of a temple of the Celtic Diablintes, which became the capital of this people in the Augustan administrative reorganization. Settled in the second half of the 1st century, its public buildings testify to the spread of the Roman way of life: theatre, forum and baths, in addition to the Celtic temple, which was rebuilt in stone. The difficulties the city experienced beginning in the 3rd century can be read in the fortifications built in that period, which are still the most impressive features of the site. In late antiquity the settlement lost its status as a capital when the Diablintes were absorbed into the Cenomani culture.
Jublains is mostly known for its "Roman camp", registered as a monument historique in 1840. Even though a simple bourg replaced the Roman city, the remarkably well-preserved ruins make Jublains an exceptional site. The département of Mayenne decided to acquire several parcels of real estate, to allow research on the early residents of the commune.
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