User blog comment:EarlOfSomerset/Favorite Issac's Empire Emperor/@comment-3980181-20110512224028

Actually, I have two:

1. Manuel I Komnenos (r. 1143-1180): he was just epic; he finished the conquest of Italy, annexed Armenia and conquered large parts of Hungary and Egypt.

2. John IV the Syrian (r. 1423-1463): Rape of Adrianople, conquest of Makuria, railroads, Zeng He, etc.