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In page Celts:

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Italy is home to Lepontic, the oldest attested Celtic language (from the 6th century BC).[16] Anciently spoken in Switzerland and in Northern-Central Italy, from the Alps to Umbria.[17][18][19][20] According to the Recueil des Inscriptions Gauloises, more than 760 Gaulish inscriptions have been found throughout present-day France – with the notable exception of Aquitaine – and in Italy,[21][22] which testifies the importance of Celtic heritage in the peninsula.[citation needed]