In other videos, we talk about the feudal system, and many times, the vassals to the kings, the dukes, the counts, the barons, often had more control over their territory than the kings might have had, and they were constantly squabbling with each other, but as people started to focus their energies on this external adventure known as the Crusades, first of all, many of these lords died. Their property went back to the state, went back to the kings. You start having less internal dissension. In a way, this idea that Pope Urban II thought of at the end of the 11th century, hey, why don't I point people externally so they stop worrying about what's going on internally, it kind of worked. Another trend is the importance of cities. In the feudal system, it's all about these manors and all about these estates, but in order to finance the Crusades, centers of trade and commerce became more important, and also, as there was more interaction between west and east and more people traveling, you can imagine that it fostered trade which centered at these cities, and that goes into the next point. Commerce and trade itself was fostered by the Crusades.