The conversion of the Roman Empire to Christianity, occurring in the golden glint of the sunset of the Ancient World, was not a concluding chapter but an opening one. The sequential conversion of the barbarian tribal invaders of the Empire and the subsequent conversion of those beyond the old imperial limes was the making of European culture, a prototypical Christendom. The process has been well studied from the perspective of kings, popes, and missionaries by some of the finest historians of our era. But the missing component in this civilizational change is that of the decisive influence of barbarian queens, Christian women who led their royal husbands in the dangerous journey from one religion to another. In recent years, much has been done to illuminate queenship in general, but a study focusing specifically on the queen’s role in conversion is lacking. This book seeks to remedy that and provide a missing piece in women’s history.