One of the many effects of the Crusades was that the pope and the kings of Western Europe became more powerful. In addition, Europeans began to trade with the Middle East. Trade increased as Western Europeans began to buy products like sugar, lemons, and spices. Naturally, increased trade led to increased cultural diffusion. Crusaders and traders learned about Arab art, architecture, medicine, and mathematics. Since the Arabs were very advanced in science and mathematics, Western European knowledge increased. Finally, after traveling to the Middle East, may Western Europeans began to see their small villages as uninteresting and even boring. Many Western Europeans began to seek adventure.
