J.B. Bury was a very smart man who lived a long time ago. He was born in 1861 and died in 1927. He was a historian which means he studied and wrote about what happened in the past.
Bury wrote many books about history. His most famous book was called "A History of Greece to the Death of Alexander the Great." It is all about the country of Greece and the people who lived there a long time ago.
Bury was really good at explaining things in a clear and easy way so that people could understand. He wrote many books that people still read today because they are so good at explaining things.
So, J.B. Bury was a really smart man who studied history and wrote books about it. He made it easy for people to understand what happened in the past.