the spirituality of the Celtic people, who have profoundly influenced modern religious thought. The opening portion of the text sets the stage for an in-depth exploration of Celtic religion by acknowledging the challenges historians face in studying a largely unwritten belief system. MacCulloch discusses the limited material available, including classical observations, archaeological artifacts, and later Irish and Welsh texts, which can offer only fragmentary insights. He posits that the ancient Celts were seekers of the divine, inherently linked to nature, and notes the role of the Druids in shaping their spiritual landscape. The narrative aims to shed light on the Celts' diverse pantheon of gods, the evolution of their religious practices, and the enduring influence of their spirituality on subsequent cultures. (This is an automatically generated summary.)