The Celtic tribes of Europe, celebrated today as the ancestors to millions throughout the world, were one of history's greatest ancient societies. Said to have developed from the early Iron-Age cultures of Central Europe, the Celts grew to become a diverse, yet formidable, society made up of hundreds of individual tribes spread across the continent. They developed extensive trade routes between their small towns, establishing a culture that would flourish independently for centuries.
A bonus faith per city with an adjacent unimproved forest. A +2 bonus in cities with 3 or more adjacent unimproved forest tiles.