Analysis of information sources in references of the Wikipedia article "Livonia" in English language version.
Livonia 1561.
A division into five rival small principalities thus developed during the thirteenth century: the State of the Teutonic Order, the Archbishopric of Riga, the bishoprics of Dorpat, Oesel–Wiek and Courland. The five principalities formed the Livonian Confederation, the Ordenstaat, until its dissolution in 1561.