Viking Cronholm was born in 1874 in Sweden into a typical late 19th century bourgeois family. Interested in sports and generally curious, he nevertheless choose the road less travelled. After a few years at sea, he trained as a physiotherapist, and in 1904 he relocated to South Africa. He was no stranger to martial arts; among other things he had boxed during his period in Chicago in the 1890s. However, in South Africa (of all places) he discovered jujitsu and apparently never looked back.
In 1907, he returned to Sweden and started teaching jujitsu in Stockholm. He became a popular instructor and his book Jiu-Jiutsu Tricks which was published in 1908 has been printed in numerous editions. Above you can see a clip from 1919 where he demonstrates some moves on an unfortunate young man. Kudos, I must say, for looking quite the gentleman while doing it!