In addition to Gauls infiltrating from the north of the Pyrenees, the Roman and Greek sources mention
Celtic populations in three parts of the Iberian Peninsula: the eastern part of the Meseta (inhabited by
the Celtiberians), the southwest (Celtici, in modern-day Alentejo) and the northwest
(Gallaecia and Asturias).[83] A modern scholarly review[84] found several archaeological groups of Celts in
Spain:
The Celtiberian group in the Upper-Douro Upper-Tagus Upper-Jalón area.[85] Archaeological data
suggest a continuity at least from the 6th century BC. In this early period, the Celtiberians
inhabited in hill-forts ( Castros ). Around the end of the 3rd century BC, Celtiberians adopted
more urban ways of life. From the 2nd century BC, they minted coins and wrote inscriptions
using the Celtiberian script. These inscriptions make the Celtiberian Language the only Hispano-
Celtic language classified as Celtic with unanimous agreement.[86] In the late period, before the
Roman Conquest, both archaeological evidence and Roman sources suggest that
the Celtiberians were expanding into different areas in the Peninsula (e.g. Celtic Baeturia). The Vetton group in the western Meseta, between the Tormes, Douro and Tagus Rivers. They
were characterised by the production of Verracos , sculptures of bulls and pigs carved in granite. The Vaccean group in the central Douro valley. They were mentioned by Roman sources already
in the 220 BC. Some of their funerary rituals suggest strong influences from
their Celtiberian neighbours.[ citation needed ]Triskelion and spirals on a Galician torc terminal, Museum of Castro de
Santa Tegra, A Guarda
The Castro Culture in northwestern Iberia, modern day Galicia and Northern Portugal.[87] Its high
degree of continuity, from the Late Bronze Age, makes it difficult to support that the
introduction of Celtic elements was due to the same process of Celticisation of the western
Iberia, from the nucleus area of Celtiberia. Two typical elements are the sauna baths with
monumental entrances, and the "Gallaecian Warriors", stone sculptures built in the 1st century
AD. A large group of Latin inscriptions contain linguistic features that are clearly Celtic, while
others are similar to those found in the non-Celtic Lusitanian language.[86] The Astures and the Cantabri. This area was romanised late, as it was not conquered by Rome
until the Cantabrian Wars of 29–19 BC. Celts in the southwest, in the area Strabo called Celtica[88]