Burgenland Croatian have influenced each other. The first Prekmurje Slovene works (for example, the Old Hymnal of Martjanci) was applied to the Burgenland Croatian books. A few of those that wrote in Prekmurje Slovene were of Burgenland Croatian descent (for example Jakab Szabár) and also Burgenland Croatian (József Ficzkó). After the dissolution of the Austro-Hungarian monarchy in 1918 the areas in which Burgenland Croats lived were divided between Austria, Czechoslovakia and Hungary. After 1921 most of these areas became part of Austria, which established a new province of Burgenland, after which the Croatian minority was named. In 1922 Austria founded the "Apostolic
Burgenland region. After the dissolution of the manors in the mid-20th century this group ceased to exist. In addition to Germans, Croats and Hungarians, Burgenland used to have substantial Roma and Jewish populations, wiped out by the Nazi regime. Before their deportation during 1938, the traditionally very religious Burgenland Jews were concentrated in the famous "Seven Communities" (Siebengemeinden/Sheva kehillot) in Eisenstadt, Mattersburg, Kittsee, Frauenkirchen, Kobersdorf, Lackenbach and Deutschkreutz, where they formed a substantial part of the population: e.g. in Lackenbach, 62% of the population was Jewish as of 1869. After the war, Jews from Burgenland founded the Jerusalem haredi neighbourhood of