Much of the information in the book is correct, but like other written documents, - contains known data at the time.  With later research from others like "Hvorfra stammer slegten Hagerup? v/ S.H. Finne-Grønn, - published after 1926, p. 425-438", and the use of Internet and search engines, it has been possible to put together facts that was not available to Sofus Elvius when he was commissioned to write the book.  If you consider the content in the book of 1902 as the only true faith, well - Wake up!!!  The book contains rumors 

While the book include the ancestors from Eiler "Kongel" Hagerup 1717-1799 as real decendants, others claim that these individuals as not real Hagerup as they were not  blood related.  This is not entirely correct.  

Hans Hagerup 1717-1781, was stiftsamtmand in Christiansand at the same time his adopted brother Eiler Kongel Hagerup was bishop in the same city.  They associated as brothers in this period.

Hans was probably named after his great grandfather Hans Lauritzen 1634-1695 who was married to Gunhild Stub 1652 -1717.  He was a vicar at Spydeberg, south - east of Oslo.

Hans Lauritzen 1634-1695 was also the grandfather of Eiler Kongel Hagerup.  There is no doubt that Hans Hagerup and Eiler Kongel Hagerup were blood related.

This consanguinity was the reason why Eiler Kongel was brought up with the bishop in Trondheim, and not with his own brothers and sisters.  The young lad was a bright and the bishop used his influence to register the boy for studies in theology at the university of Copenhagen under the name Eiler Konglw Hagerup.  

All the above facts above are verifiable and no-one has been able to prove otherwise.  The records from the 1500 and 1600 are at best; - sketchy.  There might be more blood connections that we do not know.  

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A branch of the family after Eiler Kongel Hagerup was taken into nobility by the Danish King Christian V.  The letter of nobility was sent by courier through Sweden during winter.  A snowstorm delayed the letter which reached the recipient 4 days after his death, but this had no effect on the Royal Decree.  The name Hagerup-Gyldenpalm ceased after a couple of generations, and the last carrier of the name;  Hans HAGERUP GYLDENPALM 1774-1827; lost his privilege in 1822 when the Norwegian Parliament passed a law to abolish gentry.  

The publication from 1902 confirms a rumor has it that the family came from a Søren Hagerup living in Denmark.  Like many rumors over generations there is no verification today to prove it as a fact through other sources.  There are no verifiable links from Denmark to Norway.  All verifiable links goes the other way.  

On these pages there are only 2 bishops that bore the name Hagerup, but there are dozen of other bishops that are closely, - or less closely, - related to the family.  Other "men of the cloth" extends into the future like a regular army.  Fighting men with distinctions are not rare and civil servants are plentiful.  One may add "stiftsamtmenn" (King representative) and a prime minister. Delegates to the parliaments in Copenhagen and Oslo have appeared from early 1800.  The first delegate from Bergen in 1814 was E. Hagerup.  Before election he was stiftsamtmann and later became grandfather to the composer Edward Grieg. Stiftsamtmann Edward Hagerup studied in Copenhagen with  "Stiftsamtmann" and later "Stortingspresident" Wilhelm Friman Koren Christie.  When the Norwegian constitution was written on May 16th 1814 at Eidsvold, north of Oslo, a document  to be signed on the following day,  Wilhelm was in charge of the delegates and  Edward was the "Grey Eminence" that moved events outside the Congressional Hall.  They were 2. nd cousins as  Edwards mother was born Christie.

The first verification of the use of the name that we know today is Anne Margrethe Hansdatter Hagerup b. abt. 1565.  She was married to a mayor in Trondheim and that's why there are historical records even today.  We do not know her parents.

Her children did not take the name Hagerup, but her grandchildren did, at least 12 that is recorded.  4 generations after Anne Margrethe the bishop Eiler Hagerup (1685-1743) was born and he is by some considered the "founding father" of the family.  

Another branch that are descendants after Honningdal Hagerup (1729-1789) have borne the name for many generations.   Today the name is no longer a protected name in Norway.  Anyone may take the name.   Its time to take on another surname, - maybe Kongel?