The oldest traces of human occupation in Paris, discovered in 2008 near the Rue Henri-Farman in the 15th arrondissement, are human bones and evidence of an encampment of hunter-gatherers dating from about 8000 BC, during the Mesolithic period.[1] Between 250 and 225 BC, the Parisii, a sub-tribe of the Celtic Senones, settled on the Île de la Cité and on the banks of the Seine, built bridges and a fort, minted coins, and began to trade with other river settlements in Europe.[2]