Celtiberian

Celtiberian is an extinct Celtic language of the Indo-European family, classified within the Q-Celtic group, spoken by the Celtiberian peoples of northeastern Iberia in the territory roughly bounded by the Douro, Tagus, Jucar and Turia rivers, with inscriptions running from the second century BC to the first century AD. It is directly attested in nearly 200 inscriptions and some 300 shorter records, most written in a native Celtiberian script derived from Iberian writing but some in the Latin alphabet, the longest and most important being the Botorrita bronze plaques of around 100 BC, which preserve detailed religious and administrative texts. Celtiberian retains a number of archaic Indo-European features, including the relative pronoun ios and consonant clusters lost in other Celtic languages, suggesting that it split off from the rest of the Celtic family at an unusually early date. The language disappeared as its speakers were assimilated into the Roman world and adopted Latin.