The Catholic Church began its own reform to stop the spread of Lutheranism.
The Pope Paul III called the Council of Trent to correct the mistakes of Catholics.
- Prohibition of the sale of indulgences
- Creation of seminaries to improve the education of the clergy
- Obligation of the clergy to lead an exemplary life
- Creation of the catechism (basic teachings)
The Pope created the Inquisition in 1542, a tribunal that persecuted and punished those who didn't follow the Catholic doctrine. The Index Prohibitorum was written, with the list of forbidden books. For example: "95 Theses".
The Society of Jesus (Jesuits) spread the ideas of the Counter Reformation.