Well, not really. The Empire of Charlemagne, the East Roman Empire (falsely styled Byzantine), and the Austro-Hungarian Empire are better examples.
The Holy Roman Empire was "The Holy Roman Empire of the German Nation". No different in principle than the "Roman Empire of the Serbs and Greeks" that Serbia made in the 1300's. In other words, a petty nationalism.
I tend to doubt that a permanent "worldwide peace" is possible, and would take the past "evils" over the present ones any day.
Peace is possible if rulers will conform themselves to Christ. Peace among Christians, which is what I am really after, is eminently possible.