The patrimony for Nadruvia and Scalovia was remembered by post-Mindaugas grand dukes of Lithuania: Algirdas, during the negotiation on Lithuania's Christianization, postulated (1358) for the emperor of Holy Roman Empire, Charles IV, that he would accept Christianity when the Order was transferred to Russia's border to fight Tatars and Lithuania would be given back the lands to Alna, Pregolya rivers and Baltic sea. Lithuanian grand dukes probably considered the Order to be illegitimate state, propagandizing the mission of Christianization as the fundamental aim and factually seeking political authority at one time. Additionally, after the Order had become Protestant state, the conquered Baltic lands were not acknowledged as its possession by the popes.