On 30 January 1018, peace was made in Bautzen. Bolesław I kept the Lusatian march and Upper Lusatia ("Milzenerland"). Thietmar, the principal German chronicler of the time, did not give precise details as to the conditions on which Bolesław retained these lands. According to German historian Schneidmuller, he held them as an imperial fief. According to Polish historian Pawel Jasienica, the lands were held without any obligation towards the empire. The Cambridge Medieval History states that they were Bolesław's on "purely nominal terms of vassalage".