Meletius of Lycopolis was a man who lived in a place called Lycopolis a long time ago. He was a Christian bishop which means he was a leader of the church in that area. He was important because he led a group of Christians that had different ideas about how to worship and follow God.
At that time, a group of Christians called the Arians didn't believe that Jesus was fully God. Meletius believed differently and said that Jesus was fully divine. This made him very popular with the people who agreed with him. However, it made him unpopular with the Arians who didn't like what he said.
Meletius was so passionate about his beliefs that he ended up disagreeing with some other Christian leaders. This caused a big disagreement between them that lasted for many years. In the end, Meletius' beliefs became more popular and the church leaders agreed with him.
Meletius was famous for his teachings about how to worship God and for his beliefs about Jesus. Many people have continued to study his teachings and follow his ideas about what it means to be a Christian. Even today, his beliefs are still being talked about and studied by many people who want to understand more about Christianity.