By the end of the 13th century, Crusading had become more expensive. The time had passed when a Crusade army was made up of knights who served under a lord and paid their own way. Economic pressures caused many nobles to seek royal service. Royal armies, therefore, became more professional, and many knights as well as foot soldiers served for pay. Moreover, the rise of royal authority meant that great Crusades could no longer be cobbled together by feudal lords but were increasingly reliant on kings, who were by their nature easily distracted by events at home.
Answer: The Roman Empire was one of the most advanced civilizations for its time. It used technology such as the aquifer, to distribute water into people's homes. It was one of the biggest empires in history, stretching from Europe to Northern Africa.
