The 11th to 15th centuries saw major challenges to Church authority and social unrest in Europe. The Great Schism split Christianity, while the Crusades and Inquisition aimed to defend the faith. Theological debates and heresies like the Cathars emerged, questioning Church doctrine. Papal power was challenged by secular rulers and reformers like Wycliffe and Hus. New monastic orders formed, emphasizing poverty and preaching. Universities grew as centers of learning, while Gothic architecture and vernacular literature flourished. Social tensions increased between nobles, clergy, and commoners.