How were the crusades justified?

The Crusades were justified by religious leaders and participants as a response to perceived threats against Christianity and the Holy Land, particularly the Muslim control of Jerusalem. They were framed as a holy war, with the promise of spiritual rewards, including indulgences and the forgiveness of sins for those who participated. Additionally, the Crusades were portrayed as a means to reclaim Christian territory and protect pilgrims traveling to sacred sites. Political motivations, such as the desire for land and power, also played a significant role in justifying these military campaigns.