Final answer:
Francis de Sales was the individual who worked to restore peace to the Church after the Council of Trent through preaching and writing, contributing significantly to the Counter-Reformation.
Step-by-step explanation:
The individual who worked diligently to restore peace to the Church after the Council of Trent through preaching and writing was Francis de Sales. The Council of Trent played a crucial role in the Counter-Reformation, which was the Catholic Church's response to the Protestant Reformation initiated by figures like Martin Luther and John Calvin. Francis de Sales is known for his contributions to the Counter-Reformation efforts by promoting the teachings of the Church and countering the influence of Protestantism through his pastoral work and writings.