Who was was a burgraviate of a multi-ethnic complex of territories in central Europe that developed during the Early Middle Ages and continued until its dissolution in 1806?
Burgraviate of Rheineck The Burgraviate of Rheineck was a burgraviate of the Holy Roman Empire. It was a member of the Upper Rhenish Circle.
Prince-bishopric of Dorpat The Bishopric of Dorpat (Estonian: "Tartu piiskopkond" ; Low German: "Bisdom Dorpat" ; Latin: "Ecclesia Tarbatensis" ) was a medieval prince-bishopric, i;e; both a diocese of the Roman Catholic Church and a temporal principality ruled by the bishop of the diocese. It existed from 1224 to 1558, generally encompassing what are now Tartu County, Põlva County, Võru County, and Jõgeva County in Estonia. The prince-bishopric was a sovereign member of the Holy Roman Empire (formally from 6 Nov 1225) and part of the Livonian Confederation.