Nicolau Aymerich was a man who lived a long time ago. He was born in Spain in the year 1350. He became a very important person in the Catholic Church, which is a big group of people who believe in God and Jesus.
Aymerich wrote many books about the Catholic Church and how it worked. He talked about how the church could punish people who did bad things, like not believing in God or not going to church. He also wrote about how to make sure people followed the rules of the church.
Aymerich was so important to the church that he was given a special job. He became the Inquisitor General, which meant he was in charge of making sure people were following the rules of the church. He would go around to different towns and make sure people were praying, going to church, and doing what they were supposed to do.
Some people didn't like Nicolau Aymerich very much because they thought he was too strict. They thought that he punished people too harshly and that he didn't care about them. But other people thought he was doing the right thing by making sure everyone followed the rules of the church.
Overall, Nicolau Aymerich was a very important person in the Catholic Church. He wrote books and made sure people were following the rules of the church as the Inquisitor General. Some people liked him, and some people didn't, but he was an important figure in history.