Rygh was professor of history at the
Royal Frederick University (now University of Oslo) between 1866 and 1875. He was director of
Oldsaksamlingen (which subsequently became the
Museum of Cultural History) from 1862 and professor of Nordic archaeology from 1875 – the first professor of archaeology at any
Scandinavian university. He led excavation of the
Tune ship 1867. His work about Norwegian antiquities
Norske Oldsaker (1885) is recognized for its detailed illustrations and even today is still a significant reference source. From 1879 to 1899, he chaired the
Norwegian Historical Association. Oluf Rygh is best known for creation of a registry of Norwegian farm names
Norske Gaardnavne which is a 19 volume set of books based on a manuscript prepared from 1897 to 1924. The book contains a standardized notation, information on pronunciation, historical forms and the
etymology for recorded farm, estate and manor names in
Norway, which became the standard for place names in Norway. It inspired similar research in
Sweden and
Denmark. Rygh died in 1899 at
Ulefoss in
Holla Municipality in
Telemark county. At the time of his death, only three and one half volumes had been published. ==Legacy==