The crusaders encountered a long and rich artistic tradition in the lands they conquered at the end of the 11th century and the beginning of the 12th. Byzantine and Islamic art (that of both the Arabs and the Turks) were the dominant styles in the Crusader states, although there were also the styles of the indigenous Syrians and Armenians. These indigenous styles were incorporated into styles brought by the crusaders from Europe, which were themselves highly varied, stemming from France, Italy, Germany, England, and elsewhere. On the whole the Eastern Christian styles were more significant influences than Islamic art; the artists working in the Crusader lands are assumed to have had the same variety of backgrounds. Many art historians attempt to guess the backgrounds, in terms of ethnicity, place of birth and training, of the artists involved with particular works, an effort treated with caution by Kurt Weitzmann, Doula Mouriki, and Jaroslav Folda, author of the most recent detailed survey.