Take a look at Gregory VII's call to all Christians to take up arms against the heathens invading the Middle East in 1074.

Read over this 802 CE promise of the Missi to swear fidelity to Emperor Charlemagne and to abide by the laws he had set forth.

Bernard Atton, Viscount of Carcassonne, acknowledges fealty to Lord Leo, abbot of the monastery of St. Mary of Grasse, in this document.

Look over these land grants which were used by the king to give land to knights in return for their loyal service during wars.

Ever wonder what it takes to be a king? Read Louis IX's advice to his son, who would become King Phillip III, about how to rule and reign.