​Welcome to The Ancient Calendar: Why We Celebrate—Holiday Lore Explained. The past is still present, and your favorite modern holiday traditions have deep, often surprising roots. Every week, we trace a modern celebration back through its turbulent history and its deepest legendary roots. Join us as we explore the ancient rituals behind major festivals, from the Solstices to the Harvest and New Year. Discover the global mythology and folklore that inspired everything from Valentine's Day to May Day, and find out why the Greeks, Romans, Celts, and Norse still shape how we celebrate today.