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In page Mons, Belgium:

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The first signs of activity in the region of Mons are found at Spiennes, where some of the best flint tools in Europe were found dating from the Neolithic period. When Julius Caesar arrived in the region in the 1st century BC, the region was settled by the Nervii, a Belgian tribe. A castrum was built in Roman (Belgica) times, giving the settlement its Latin name Castrilocus. The name was later changed into Montes for the mountain on which the castrum was built.[citation needed]