Final answer:
Prejudice increased during the Black Death due to scapegoating. Christian leaders and masses had different views because of their priorities. Aquinas and Pope Gregory opposed prejudicial action against Jews based on principles of justice and compassion.
Step-by-step explanation:
The Black Death, a bubonic plague pandemic that struck Europe in the 14th century, led to an increase in prejudice. People believed that the plague was a sign of God's displeasure and sought scapegoats to blame, often targeting Jewish communities. The Christian Church leaders had a different view from the Christian masses because they were concerned with maintaining their authority and appeasing God's anger, while the masses were more focused on their own salvation and the church's inability to control the plague.
Thomas Aquinas and Pope Gregory opposed prejudicial action against Jews. Aquinas argued that Jews should be treated with justice and compassion, whereas Pope Gregory condemned the violent persecution of Jews and emphasized the importance of Christian virtues. They believed in the principles of love, mercy, and justice, and recognized that prejudicial actions went against these principles.