However there's no longer a sharp distinction as Germanic languages or Romance Languages have at least co-official status in all of the traditionally Celtic polities and the region has a history of Protestantism that differentiates it from its Mediterranean Latin or Eastern European Slavic neighbors.
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Pytheas, Greek explorer, who will explore northwestern Europe, including the British Isles (d. c. 310 BC) (approximate date)
Matres and Matrones, ancient deities venerated in northwestern Europe
The DR3-DQ2 haplotype is notable because of the very strong linkage between genes that extends into the HLA-A, -B and -C regions of the HLA gene complex in northern and northwestern Europe.
The Rolls of Oléron (Rôles d'Oléron, also known as the "Judgments of Oleron" and the "Rules of Oléron") were the first formal statement of "maritime" or "admiralty" laws in northwestern Europe.