Before Europe was conquered by the Romans in the early centuries CE, members of the priestly elite of Ireland, Britain, and modern-day France were known as Druids. In their religious culture, groves of trees, bodies of water, and elevated landscapes were closely associated with various gods, goddesses, and spirits and became important sites for worship. Today, Pagans who specialize in the revival of practices and beliefs from these parts of Europe often refer to themselves as Druids or Celtic reconstructionist Pagans.