Scott, Dr. Clark has produced a very helpful chart that can be downloaded from the links below:
http://www.modernreformation.org/Ref-RomeChart1.pdf
http://www.modernreformation.org/Ref-RomeChart2.pdf
http://www.modernreformation.org/Ref-RomeChart1.pdf
http://www.modernreformation.org/Ref-RomeChart2.pdf