Well, imagine a big group of people who live in a place called Dorpat a long, long time ago -- before computers and phones were invented. They all believed in the same religion and they had a special group of people called bishops who helped lead their church.
One of the bishops was particularly important because he was in charge of all the other bishops in that area. This was called the bishopric of Dorpat. It was kind of like a boss of the bosses.
The bishopric of Dorpat was responsible for making important decisions about how their church should run and grow. They made sure people were following the right rules and traditions. They also helped guide the people of Dorpat to be good and kind to others.
Even though the bishopric of Dorpat doesn't exist anymore, it was an important part of history that helped shape the way people think about religion and leadership.