Frequently Asked Questions about the Diet of Worms What is the Diet of Worms? The Diet of Worms refers to an imperial assembly that took place in the city of Worms, Germany in 1521. It was an important event during the Protestant Reformation where Martin Luther was called to defend his controversial teachings against the Catholic Church. Learn more about the Diet of Worms. Why is it called the Diet of Worms? The term “Diet” comes from the medieval Latin word “dieta,” which means a formal assembly. “Worms” refers to the city where the assembly was held, which is pronounced…