The Muslims ruled Andalusia for more than eight centuries, during which the Muslims flourished greatly, and they made progress in all fields that dazzled the whole world, and achieved many victories over their enemies. ). The history of the Vikings was unknown until recently, until excavation and research work began in Britain and northeastern Canada, and its results were the main point from which they began to learn about the history of the Vikings and everything related to those Normans, or the Vikings, they are the people of Denmark, and they are Scandinavians. Sweden and Finland. The main economy for them was agriculture, and because the agricultural season for them was very short, fishing and maritime trade played a major role in their lives, and it allowed them long time to exercise their conquest in other countries, so they returned to their throats.