Early Christianity

http://en.wikipedia.org/wiki/Didache
http://www.earlychristianwritings.com/didache.html
http://www.newadvent.org/cathen/04779a.htm
http://www.newadvent.org/fathers/0714.htm
http://www.jewishencyclopedia.com/articles/5181-didache

https://en.wikipedia.org/wiki/Early_Christianity
http://www.pbs.org/empires/romans/empire/christians.html