The intellectual and cultural achievements of the Muslim world had a complex influence on European attitudes. On one hand, the advanced state of Islamic science, medicine, philosophy, and arts was admired by European scholars and intellectuals. The translation of Arabic texts into Latin, particularly in centres of learning like Toledo, Spain, brought a wealth of knowledge to Europe, influencing the Renaissance. However, on the other hand, these achievements also stirred envy and fear among some Europeans, who viewed the intellectual and cultural sophistication of Muslim societies as a challenge to Christian intellectual and cultural dominance. This ambivalence often contributed to the hostility towards Muslims, as admiration was mixed with fear and envy.

The legal systems in various European countries reflected their hostility towards Muslims through laws and policies that were discriminatory and restrictive. These laws ranged from prohibitions on Islamic religious practices to limitations on the rights of Muslims to own property or engage in certain trades. In some regions, Muslims were forced to wear distinctive clothing or badges, mirroring similar discriminatory practices against Jews. Such legal discrimination was often justified by the prevailing negative stereotypes and fears about Islam. These laws not only marginalised Muslims but also institutionalised the hostility against them, making it a part of the legal and social fabric of these societies.

Misconceptions and stereotypes played a critical role in shaping public opinion about Muslims in medieval Europe. The lack of direct contact between the majority of Europeans and Muslims meant that public perception was largely based on hearsay, exaggerated tales from returning crusaders, and biased Church teachings. Muslims were often stereotyped as barbaric, heathen, or inherently violent in popular literature, art, and sermons. These stereotypes were not only unfounded but also oversimplified the complex nature of Islamic culture and civilisation. Such misrepresentations fostered fear and mistrust among the European populace, contributing significantly to widespread hostility.

Economic interests significantly influenced European hostility towards Muslims. European states, particularly those with maritime power, saw Muslim control over key Mediterranean trade routes as a direct economic threat. Muslim traders and empires like the Umayyad and Abbasid had established sophisticated trade networks, encompassing luxury goods such as spices and silk, which European merchants and states were eager to access. This rivalry over trade routes and economic influence led to heightened tensions. Furthermore, the prosperity of Muslim-ruled regions, contrasted with the relative economic stagnation in parts of Europe, exacerbated these tensions, often manifesting in hostility and military conflicts.

The Crusades had a profound impact on the relations between Christian rulers and their Muslim counterparts, largely contributing to a prolonged period of mistrust and conflict. Initially, the aggressive military campaigns of the Crusades created a direct confrontation between Christian and Muslim rulers, with territories like Jerusalem being the focal points of these conflicts. These wars, driven by religious zeal and territorial ambitions, established a precedent for hostility and suspicion in diplomatic relations. Even after the Crusades, the legacy of these conflicts continued to influence how Christian and Muslim rulers interacted, often overshadowing potential avenues for peaceful and cooperative relations. The mutual distrust and antagonism fostered during the Crusades had long-lasting effects on Christian-Muslim political dynamics.