From the earliest maps of the Gulf of Mexico by the Spanish explorers to the beginning of the 20th century, claims were made that a Welsh prince named Madoc brought thousands of colonists to North America centuries before Columbus. Though those claims were debunked, the claimants denigrated, and much of the evidence was lost or destroyed, some deliberately, the story lives on. Through shrewd and thorough investigation, this book shows that there is high probability and substantial documentation that four different countries knew the stories were true in general even if errant in details. None of those governments were or are yet willing to acknowledge the truth of such a mass immigration. This book tells why. In doing so, it also reveals some of the most appalling political intrigues in history. Prevailing and opposing political and religious doctrines are dissected and the reasons for such a huge, longstanding, and base coverup explained.