Bohemian

Because the first gypsies in France were taken for followers of Jan Hus, the heretic from Bohemia, various painters and poets were still labeled bohemian to this day. An amalgamation of prejudices based on a misunderstanding, it did not come better than that, and the fact that poets had been identified with vagrants, gypsies, and heathens was pretty good, too. 

(Cees Nooteboom, from Musings in Munich, in Nomad's Hotel)