Check out The conquests of Trajan mod for RTW 1.5 It includes historical starting locations, edited faction names, a map that extends all the way to India, Historical characters and much more.
A 4tpy script is now avaliable in the RTW mods download section - this script was specifically designed for this mod so do not use any other scripts.
The Conquests of Trajan 1.2 full
http://www.twcenter.net/forums/downl...o=file&id=1535
The conquests of Trajan 4tpy script
http://www.twcenter.net/forums/downl...o=file&id=1538