What are catherages?

Why did people move to cities and away from manors during the middle ages? What does all quiet on the western front mean? What time is 1915? Who fought against Christians during the crusades? What was a grant of land from a lord to vassal? Who had control of Jerusalem at the end of the 3RD crusade? What is people conquered by Cortes means? What seas touched the Roman empire? Who invented boxer shorts? What importance did the caste system have in West Africa? What Environmental change on urban areas in the period 600-1450? What does the name vulcan mean? What groups included the ostrogoths visigothsfranks and vandals? What do you call a very wise man? What historians think about Augustus Caesar? How many weeks are there in a century? Which were the two side that fought in the crusades? What did Romans do with shields? During what period did the nomads of central Asia impact the other global civilizations of the Eastern Hemisphere in the postclassical era? Were you able to identify the characteristics of gregorian chants?