In the Late Middle Ages, new methods of warfare began to render classical knights in armour obsolete, but the titles remained in many countries. Holy Roman Emperor Maximilian I is often referred to as the "last knight" in this regard. The ideals of chivalry were popularized in medieval literature, particularly the literary cycles known as the Matter of France, relating to the legendary companions of Charlemagne and his men-at-arms, the paladins, and the Matter of Britain, relating to the legend of King Arthur and his knights of the Round Table.