We just learned about the Saint Patrick who told people in Ireland about Jesus.
Another part of ancient Christianity was the meeting between Leo and Attila .
Leo was a leader called a Bishop of the church in Rome, Italy.
Rome was usually thought of as the most important city of all, so the Bishop in Rome was usually the most important Bishop and got called the "Pope".
Attila the Hun was a warrior who was attacking all over the place, and in 452 AD came to Italy to try and take over.
The Emperor of Rome sent Pope Leo and a few other people to meet Attila and try to see if they could talk to him and make him not come attack Rome.
No one knows really what was said, but after meeting with Pope Leo, Attila packed up his troops and left Italy.
A person who goes and meets with other leaders of countries is called an "Ambassador" and Pope Leo was thought to be a very good ambassador because he helped save Rome from Attila the Hun.
(from: wikipedia - pope leo i)
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