During the Crusades, many kings, nobles, and knights of Europe were involved in this action. The most famous of these crusader leaders were King Saint Louis IX of France and King Richard I the Lionheart of England. These leaders would usually lead their armies to the Middle East to cooperate or compete with other Crusader leaders.
Although the Crusaders were not part of an empire, they had close ties with various countries in Europe. Many of the Crusader leaders were members of the royal family or nobility of European countries, and their influence and status were increased as a result. In addition, European countries also strengthened commercial and cultural exchanges with the Middle East through the Crusades, which further promoted Europe's economic development and cultural prosperity.
During the Crusades, relations between European countries also changed. Relations between some countries, such as France and the United Kingdom, have been strengthened, while contradictions and conflicts have arisen in others. These changes in relations have also affected the international political landscape in Europe.
In general, the crusaders did not belong to a certain empire, but were separate military groups of knights and soldiers from different regions. Although they share common goals and beliefs, their organizations and actions are fragmented and independent. The impact of the Crusades was not limited to the Middle East, but also profoundly influenced the historical and cultural development of Europe.