Difference between Queen Regnant and Holy Roman Emperor

QUEEN REGNANT vs HOLY ROMAN EMPEROR: NOUN

A female monarch who reigns in her own right, in contrast to a queen consort, who is the wife of a reigning king.
A queen reigning in her own right.
A female sovereign ruler

Regious, Kingling, Prince, Queen of england, Queenhood, Kingless, King, Grand duchess, Queen consort, Monarch, Female aristocrat, Queenlike, Queen dowager, Female monarch, Queen

Palatine, Otto i, Frederick barbarossa, Ferdinand iii, Ferdinand ii, Charles ii, Frederick ii, Ferdinand i, Charles, Francis ii, Barbarossa, Elector, Charlemagne, Charles i, Otto

Unqueen, Regious, Kingling, Prince, Queen of england, Queenhood, Kingless, King, Grand duchess, Queen consort, Monarch, Female aristocrat, Queenlike, Queen dowager, Queen

Kaiser, Caesar, Trajan, Nero, Lyons, Henry iv, Vienna, Capitulation, Bourbon, Palatine, Frederick barbarossa, Charles, Elector, Charlemagne, Otto

For example, Urraca, unlike any other woman discussed in this project, ruled as queen regnant, though her right to do so was frequently contested.
Queen Regnant automatically passes on her dynastic name to her son or daughter who succeeds her.
In most countries, Jeanne would automatically have become queen regnant on the death of her baby brother.

War against both Spain and its Habsburg ally, the Holy Roman emperor.
European Commission metaphorically assuming the role of a new Holy Roman Emperor.
Pope John XII was crowned as the first Holy Roman Emperor.
He was nominated Cardinal by Charles V, Holy Roman Emperor.
Ferdinand I, Holy Roman Emperor and King of Bohemia.
Holy Roman Emperor were thrown out of a window.
The Holy Roman Emperor sent his army to Rome.
Charles V of Spain is declared Holy Roman Emperor.
Holy Roman Emperor to be crowned by the Pope.
Europe, from lowly count to Holy Roman Emperor.