History Shorts: The Edict of Milan (313 A.D.)

After Constantine won the Battle of Milvian Bridge, he assigned his victory to the Christian god. In response, he legalized Christianity, ended Diocletian's persecutions, and included incentives for the faithful. By the end of the century, church and state became one. Two hundred years later, the church became the only organization in Western Europe capable of preserving civilization and record keeping.
The first link is a student project. The second is from the Catholic Church.
http://www.youtube.com/watch?v=y5XeVWEFSO4
http://www.youtube.com/watch?v=oqLBeCmyaKY