EN
The expedition of the First Crusade veteran and Prince of Antioch Bohemond, against the Byzantine Emperor Alexios I. Komnenos (1081 – 1108) in 1107/1108 is considered to be a peculiar epilogue of the early crusade movement initiated by the Pope Urban II. at the council in Clermont, France, in 1095. At the same time, it represents another stage of the Byzantine-Norman wars, first taking place in southern Italy and after 1081 in the regions of Byzantine Epirus, Macedonia and Thessaly. In the first part of this study, authors focus on the historical background of the campaign of 1107/1108 and try to analyse its causes.