What do we know about Christian-Muslim relationship before the crusades?

Before the Crusades, Christian-Muslim relationships were complex and varied. There were periods of conflict and tension, but also times of coexistence and cooperation. Muslims ruled over Christian populations in regions like Spain, Sicily, and the Middle East, leading to interactions and exchanges between the two groups in areas such as trade, science, and culture. Additionally, there were instances of alliances and diplomacy between Christian and Muslim rulers to address common threats.