der Herrscher
ruler
A person with the highest power and authority in a state, such as a king, emperor, or dictator.
Ludwig XIV. gilt als Inbegriff des absolutistischen Herrschers.
Louis XIV is considered the embodiment of the absolutist ruler.

ruler
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ruler
A person with the highest power and authority in a state, such as a king, emperor, or dictator.
Ludwig XIV. gilt als Inbegriff des absolutistischen Herrschers.
Louis XIV is considered the embodiment of the absolutist ruler.

'Der Herrscher' (the ruler) is the person noun related to the verb 'herrschen' (to rule). The ending '-er' indicates the person who performs the action of the verb.
Der König herrschte über ein großes Reich.
The king ruled over a large empire.
To name the territory or area being ruled, German uses the preposition 'über' followed by the accusative. One is a ruler 'über' (over) a country, a people, or a market.
Der Pharao war der Herrscher über das alte Ägypten.
The pharaoh was the ruler over ancient Egypt.
In historical or political contexts, 'Herrscher' (ruler) is often combined with adjectives such as 'mächtig' (powerful), 'weise' (wise), 'grausam' (cruel), or 'absolutistisch' (absolutist).
Die Geschichte erzählt von einem weisen und gerechten Herrscher.
The story tells of a wise and just ruler.
The figurative meaning is often used in business, sports, or technology. If the text is not about a country or people, this metaphorical meaning is usually intended.
Google ist der unangefochtene Herrscher über den Suchmaschinenmarkt.
Google is the undisputed ruler of the search engine market.
gentleman / Mr.
'der Herr' and 'der Herrscher' can both mean a person with power. 'der Herr' is more general here and can also mean someone who has control over people, animals, or an area. 'der Herrscher' is more specific: it usually means a person at the head of a state, for example a king, emperor, or dictator. Figuratively, 'Herrscher' can also mean someone or something that dominates an area. When it is about political or very great power, 'Herrscher' is more natural and more precise.

Nach der Nachricht übernahm ein neuer Herrscher die Macht im Land.
After the news, a new ruler took power in the country.
Der Gutsherr war früher der Herr über das ganze Land in diesem Dorf.
In the past, the lord of the manor was the master of all the land in this village.