The Early Church. From the beginnings to 461 -- Prof. W.H.C. Frend (there are other books by the same author on the early Church).
A New Eusibius -- edited by Stephenson & Frend
I heard Professor Frend speak once, and, in my opinion, he is one of the most authorative figures on the Early Church, although not the easiest of people to listen to -- he thinks everyone else is a professor I think.
