Plot: In the midst of the struggle between kings, emperors, sultans and popes, "Glow and Darkness" tells, as never before, the intertwined stories of characters such as Saladin, Emperor Barbarossa, Richard the Lionheart, Philip Augustus, Francis of Assisi and Eleanor of Aquitaine, among others. It is the time of the burghs, the fairs, the Provencal literature and the crusades