We just learned about the Decretum Gratiani.
Another part of early Christianity is the cathedral Notre-Dame de Paris.
In 1160 AD in Paris, the leader of the church there was Maurice de Sully.
He thought that they should build a really big nice church in a style called "Gothic style", and dedicate it to Jesus' mother Mary.
The cathedral of Notre-Dame de Paris became very famous in Paris, and it was made even more famous later in 1831 when someone wrote a story about a hunchback who rang the bells in the tower.
(from: wikipedia - notre-dame de paris)
Kid Facts - Blast from the past: Holy Nails