Emperor Dagobert IX is a fictional character

Fictional character

A character is the representation of a person in a narrative work of art . Derived from the ancient Greek word kharaktêr , the earliest use in English, in this sense, dates from the Restoration, although it became widely used after its appearance in Tom Jones in 1749. From this, the sense of...

 from Isaac Asimov

Isaac Asimov

Isaac Asimov was an American author and professor of biochemistry at Boston University, best known for his works of science fiction and for his popular science books. Asimov was one of the most prolific writers of all time, having written or edited more than 500 books and an estimated 90,000...

's Foundation and Empire

Foundation and Empire

Foundation and Empire is a novel written by Isaac Asimov that was published by Gnome Press in 1952. It is the second book published in the Foundation Series, and the fourth in the in-universe chronology...

. He is one of the last, if not the last, emperor of the Galactic Empire

Galactic Empire (Asimov)

In Isaac Asimov's Robot/Empire/Foundation series of novels, the Galactic Empire is an empire consisting of millions of planets settled by humans across the whole Milky Way Galaxy. Its symbol is the Spaceship and Sun logo.-Author's creation of the empire:...

.

He fled the Great Sack of Trantor

Trantor

Trantor is a fictional planet in Isaac Asimov's Foundation Series and Empire Series of science fiction novels.Trantor was first described in a short story by Asimov appearing in Early Asimov Volume 1. Later Trantor gained prominence when the 1940s Foundation Series first appeared in print . Asimov...

 along with his family in 260FE and moved the capital planet to Delicass, which was renamed Neotrantor. Neotrantor was about three parsec

Parsec

The parsec is a unit of length used in astronomy. It is about 3.26 light-years, or just under 31 trillion kilometres ....

s from Trantor.

When visited upon by Ebling Mis

Ebling Mis

Ebling Mis is a fictional character from Isaac Asimov's Foundation Series. Specifically, he is one of the main characters from the latter half of the novel Foundation and Empire. Mis is the Foundation's greatest psychologist and a very prominent scientist...

, Bayta, Toran Darell and the Mule

Mule (Foundation)

The Mule is a fictional character from Isaac Asimov's Foundation series. One of the greatest conquerors the galaxy has ever seen, he is a mentalic who has the ability to reach into the minds of others and "adjust" their emotions, individually or en masse, using this capability to forcibly enlist...

, Dagobert IX was described as old and detached from reality, still reminiscing about imperial times long gone. Nevertheless, after he gave permission to Elbling Mis to use the Great Library of Trantor

Library of Trantor

The Library of Trantor was one of the prominent features of the fictional planet Trantor, created by Isaac Asimov and appearing in his Empire Series and the Foundation Series...

, he made a dignified impression as befits a Galactic emperor.

His son, the crown prince Dagobert, who was a clone, tried to conspire under the influence of the corrupt governor Jord Commason. He was killed by the Mule with the help of a Visi-sonor.

The reason why Asimov gave this character the name Dagobert

Dagobert

Dagobert is a male given name, from Gaulish dago "good" and Old Frankish berath "bright".- People :* Dagobert , part of the Carl Christopher/Christoffersson Springer Hoax* Dagobert I , Frankish King...

 is not too clear, but it is likely a reference to Frankish kings of the Merovingian dynasty

Merovingian dynasty

The Merovingians were a Salian Frankish dynasty that came to rule the Franks in a region largely corresponding to ancient Gaul from the middle of the 5th century. Their politics involved frequent civil warfare among branches of the family...

.