Acceleration.
Holy Roman Empire
Holy Roman Empire, the varying complex of lands in western and central Europe ruled by the Holy Roman emperor, a title held first by Frankish and then by German kings for 10 centuries. The Holy Roman Empire existed from 800 to 1806.
For histories of the territories governed at various times by the empire, see France; Germany; Italy.
The precise term Sacrum Romanum Imperium dates only from 1254, though the term Holy Empire reaches back to 1157, and the term Roman Empire was used from 1034 to denote the lands under Conrad II’s rule. The term “Roman emperor” is older, dating from Otto II (died 983). This title, however, was not used by Otto II’s predecessors, from Charlemagne (or Charles I) to Otto I, who simply employed the phrase imperator augustus (“august emperor”) without any territorial adjunct. The first title that Charlemagne is known to have used, immediately after his coronation in 800, is “Charles, most serene Augustus, crowned by God, great and pacific emperor, governing the Roman empire.” This clumsy formula, however, was soon discarded.
https://www.britannica.com/place/Holy-Roman-Empire
Don't forget. We had to pay certain countries for whatever, IN GOLD, they wouldn't take paper money.