Oh. My. God.

How am I going to get my foot in that stirrup?

Do you know that the invention of the stirrup was a major human achievement?

THE STIRRUP AND ITS EFFECT ON CHINESE MILITARY HISTORY. Lynn White, in his Medieval Technology and Social Change, offers the interesting hypothesis that the feudal class of the European Middle Ages derived ultimately from the stirrup. After the arrival of the stirrup in Europe by the eighth century, and the primacy this gave the horse and armor in warfare, the state made, land grants in return for the pledge to provide armored knights on horseback when called. The freeman with his battle-axe no longer was the mainstay of the military might of the state, though he was still subject to general muster. Charlemagne's attempt to raise horsemen by ordering the less wealthy to pool their resources was eventually unsuccessful because of the difficulties in administering such a program. The eventual result was the distribution of land to vassals on condition of knight's service; from this followed the creation of a fighting elite, which was to have a profound effect on Western society and history. Read it all.