In an act of royal consolidation policy Lothair established the Landgraviate of Thuringia, that encompassed the remaining and predominantly non-contiguous estates of the ill-fated former Merovingian Duchy of Thuringia. The brutal conquest of the old Thuringii kingdom under king Chlothar I had left the area devastated. Subsequently the Franks desired to rule the acquisition, which proved to be only partly successful, as a long process of depopulation and recurring population replacement by Franconians, Bavarians and Christianized Slavs followed. The 1129 appointment of Herman of Winzenburg to the comital office was a failure, as he allegedly was deposed a year later on charges of breach of the peace. The sources, however provide conflicting dates. The 1131 investiture of Louis marked the beginning of smooth Ludowingian rule for more than a century.