List of states in the Holy Roman Empire (O) explained

This is a list of states in the Holy Roman Empire beginning with the letter O:

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NameTypeImperial circleImperial dietwidth=50% History
OberbronnLordshipn/an/a1232: First mentioned; fief of Lichtenberg
1352: Sold to Ochsenstein as fief of Lichtenberg
1382: Sold to Lichtenberg
1452: Sold to Lützelstein as fief of Lichtenberg
1480: To Zweibrücken-Bitsch
1551: To Leiningen-Westerburg-Leiningen
1622: To Leiningen-Westerburg-Oberbronn
1665: 2/3 to Hesse-Homburg, 1/3 to Sinclair
1727: Hessian portion to Hohenlohe-Waldenburg-Bartenstein
1732: Sinclair portion to Lewenhaupt
1764: Part of Hohenlohe portion to de Dietrich
1789: All to France
Oberehnheim (Obernai)Imperial CityUpp RhenRH1248: Free Imperial City
1679: To France
Oberelsaß
See: Upper Alsace
Landgraviate
Obermünster in RegensburgAbbacyBavRP1000s: Established with imperial immediacy
1315: HRE Princess of the Empire
1803: To the Archbishopric of Regensburg
1810: To Bavaria; suppressed
OberriedProvostryn/an/a1237: Formed
1249: Abolished
1255: Reestablished
1496: Advocacy to Freiburg within Further Austria
1725: Advocacy to St Blaise's Abbey within Further Austria
1806: To Baden
Obersalm
See: Salm in the Vosges
County
ObersteinLordshipn/an/a1075: First mentioned; to Stein
1250: Line Daun-Oberstein established
1364: Partitioned into Oberstein-Gundheim and Oberstein-Kredenburg
Oberstein-GundheimLordshipn/an/a1364: Partitioned from Oberstein
1683: Extinct; to the Palatinate
1699: To Greiffenclau
Oberstein-KredenburgLordshipn/an/a1364: Partitioned from Oberstein
1602: Extinct; to Speyer
ObwaldenImperial Valleyn/an/aTo Lenzburg
11th Century: Donated to Beromünster Abbey
?: To Murbach Abbey
1291: Sold to Habsburg; with Nidwalden became a founding member of the Swiss League
1324: Imperial immediacy
1648: Left Empire as member of Swiss Confederation
Ochsenhausen1391: AbbeySwabSP1093: Priory of St. Blaise's Abbey
1391: Independent abbey
1495: Imperial immediacy
1803: To Schaesberg-Retersbeck (Tannheim), Sinzendorf (Winterrieden) and Metternich-Winneburg and Beilstein (remainder)
1806: All to Württemberg
OchsensteinLordshipn/an/a1186: First mentioned; branch of Geroldseck
1391: Quarter of Ochsenstein sold to the Palatinate
1485: Extinct; to Zweibrücken-Bitsch
Odenheim and BruchsalAbbey
1503: Provostry
Upp RhenRP1110-8
1161: Imperial immediacy
1496: HRE Lord
1503: Converted to provostry
1507: Relocated to Bruchsal
1803: To Baden
Oettingen (Öttingen)Countyn/an/a1147: First mentioned; related to the House of Hohenstaufen
1363: Acquired Spiegelberg
1418: Partitioned into Oettingen-Oettingen and Oettingen-Wallerstein
Oettingen-BaldernCountySwabSC1623: Partitioned from Oettingen-Wallerstein
1798: Extinct; to Oettingen-Wallerstein
Oettingen-FlochbergCountySwabSC1442: Partitioned from Oettingen-Wallerstein
1522: Partitioned into itself and Oettingen-Wallerstein
1548: Extinct; to Oettingen-Wallerstein
Oettingen-OettingenCounty
1674: Principality
SwabSC1418: Partitioned from Oettingen
1440: Extinct; to Oettingen-Wallerstein
1442: Partitioned from Oettingen-Wallerstein
1674: HRE Prince
1731: Extinct; to Oettingen-Wallerstein
Oettingen-SpielbergCounty
1734: Principality
SwabSC / PR1623: Partitioned from Oettingen-Wallerstein
1734: HRE Prince
1803: Bench of Princes
1806: To Bavaria
1810: Parts to Württemberg
Oettingen-WallersteinCounty
1774: Principality
SwabSC / PR1418: Partitioned from Oettingen
1442: Partitioned into Oettingen-Oettingen, itself and Oettingen-Flochberg
1486: Extinct; divided between Oettingen-Flochberg and Oettingen-Oettingen
1522: Partitioned from Oettingen-Flochberg
1549: Extinct; to Frederick V of Oettingen-Oettingen by marriage, who assumed the name Oettingen-Wallerstein
1623: Partitioned into Oettingen-Spielberg, itself and Oettingen-Baldern
1774: HRE Prince
1803: Bench of Princes
1806: To Bavaria
1810: Parts to Württemberg
OffenburgImperial CitySwabSWbefore 1240: Imperial Free City
1803: To Baden
OlbrückLordshipLow RhenWE1190: Purchased by Wied from the Archbishopric of Cologne
1244: Wied extinct; Olbrück was divided and shared ultimately with a dozen families, often in dispute with each other
1555: All to Waldbott von Bassenheim
1788: Along with Pirmont was used to give access to the Westphalian counts
1794: To France
1815: To Prussia
Oldenburg
Grand Duke of Oldenburg, Heir in Norway, Duke of Schleswig, Holstein, Stormarn, Ditmarshes & Oldenburg, Prince of Lübeck and Birkenfeld, Lord of Jever and Kniphausen
County
1777: Duchy
1815: Grand Duchy
Low RhenPR1108: First mentioned; fief of Saxony
1143: Partitioned into Wildeshausen and itself
1181: Imperial immediacy
1278: Partitioned into itself and Oldenburg-Delmenhorst
1463: Partitioned into itself and Oldenburg-Delmenhorst
1577: Partitioned into itself and Oldenburg-Delmenhorst
1667: Extinct; to Denmark
1773: To Paul of Russia; then to Frederick Augustus of Lübeck
1777: HRE Duke
1810: To France
1814: Restored
1815: Grand Duke
Oldenburg-DelmenhorstCountyLow RhenPR 1278: Partitioned from Oldenburg
1447: Extinct; to Oldenburg
1463: Partitioned from Oldenburg
1482: To Oldenburg
1483: To the Bishopric of Münster
1484: Extinct
1547: To Oldenburg
1577: Partitioned from Oldenburg
1647: Extinct; to Oldenburg
OrangeCounty
1173: Principality
nonenone11th century: Independence from Provence
1121: Extinct in male line; to Aumelas by marriage
1173: Extinct; to Baux by marriage; HRE Prince
1193: To Baux-Orange
1289: Acquired Baux
1417: Extinct; to Chalon-Arlay
1544: To William of Nassau-Dillenburg, who took the name Orange-Nassau
1702: To France, who enfeoffed Francis Louis of Conti
1713: To France, attached to the Dauphiné
Orange-NassauPrincipalitynonenone1544: Created when William of Nassau-Dillenburg inherited Orange
1702: Extinct; succession dispute between Nassau-Dietz who took the name Orange-Nassau, and Prussia. Orange itself seized by France
1739: Acquired Nassau-Hadamar and Nassau-Dillenburg
1743: Acquired Nassau-Siegen
1747: Acquired the Netherlands
1795: Left bank territory to France
1806: United with Nassau-Orange-Fulda; then dispersed between various states
1815: King of the Netherlands and Grand Duke of Luxembourg
OrlamündeCountyn/an/a1032-1040: Mentioned, to counts of Orlamünde
By 1060: Extinct; to Weimar
1062: To Weimar-Orlamünde
Orsini and Rosenberg
Prince of Orsini and Rosenberg, Baron of Lerchenau and Grafenstein
1681: HRE Count (Personalist)
1790: HRE Prince (Personalist)
n/aFR1681: Formed
13th century: First mentioned
1681: Granted personalist vote in the Bench of Franconian Counts
1684: Adopted style of Orsini-Rosenberg
Ortenau (Mortenau)Landvogtein/an/a763: First mentioned; gau county of the Carolingian Empire
1007: To the Bishopric of Bamberg
?: To Zähringen
1218: Seized by the Emperor
1261: To Geroldseck
The Ortenau disintegrated soon after, though the title was held variously by Bach, Fürstenberg, Mörsperg, Ochsenstein and Oettingen, amongst others
1803: Much of the Ortenau to Breisgau-Modena and Baden
1819: All to Baden
Ortenburg in CarinthiaCountyn/an/a1072: First mentioned; possibly related to Grögling-Hirschberg
1306: Imperial immediacy
1418: Extinct; to Celje
1456: Extinct; to Austria
Ortenburg (Ortenberg)
Count of Ortenburg, Count and Lord of Tambach
CountyBavWT1135: Partitioned from Carinthia in the former lands of Vohburg-Passau
1145: Acquired advocacies around Passau
1158: Acquired much of Vornbach
1163: Acquired Murach
1173: Acquired Kraiburg and Marquartstein
1188: Acquired Sulzbach; partitioned into Ortenburg-Kraiburg and Ortenburg-Ortenburg
1272: Remaining territories held by Ortenburg-Ortenburg; henceforth known as Ortenburg
1319: Acquired Wildenegg
1381: Side line Ortenburg-Dorfbach founded
1395: Partitioned into Ortenburg-Neuortenburg and Ortenburg-Altortenburg
1446: Reunited by Ortenburg-Neuortenburg
1517: Acquired Mattighofen
1805: To Bavaria; received in exchange Tambach
1806: Tambach to Bavaria
Ortenburg-AltortenburgCountyn/an/a1395: Partitioned from Ortenburg
1416: Acquired Niederaltaich Abbey
1446: Extinct; to Ortenburg-Neuortenburg
Ortenburg-DorfbachCountyn/an/a1381: Founded upon marriage of Alrams I with Barbara von Rottau; fief of Ortenburg
1431: Imperial immediacy
1461: Extinct; to Ortenburg-Neuortenburg
1652: Sold to Peckenzell
Ortenburg-KraiburgCountyn/an/a1188: Partitioned from Ortenburg
1200: Acquired Rotter
1208: Acquired County Palatine of Bavaria and Neuburg
1217: Acquired Griesbach-Waxenberg
1239: Lost Ramsau and territories in Brixen to Regensburg
1248: Extinct in male line; lost County Palatine of Bavaria
1256: To Werdenberg-Sargans by marriage
1259: Sold to Lower Bavaria
Ortenburg-MurachCountyn/an/a1238: Partitioned from Ortenburg-Ortenburg
1268: Made fief of Upper Bavaria
1272: Sold to Upper Bavaria
1285: Extinct
Ortenburg-NeuortenburgCountyn/an/a1395: Partitioned from Ortenburg
1445: Acquired Saldenburg
1446: Renamed to Ortenburg
Ortenburg-OrtenburgCountyn/an/a1188: Partitioned from Ortenburg
1217: Acquired Neustadt
1229: Imperial immediacy
1238: Partitioned into itself and Ortenburg-Murach
1257: Extinct; to Gebhard of Ortenburg-Murach
1272: Renamed to Ortenburg
OsnabrückBishopricLow RhenEC783: Fief of Saxony
1180: Fief of Tecklenburg
1226: HRE Prince of the Empire
1236: Imperial immediacy
After 1648: Osnabrück alternately ruled by a Protestant Administrator and Catholic Prince-Bishop
1803: To Hanover
1806: To Prussia
1807: To Westphalia
1810: To France
1815: To Hanover
OsterbergLordship
1712: Barony
n/an/a1225: First mentioned; to Elchingen Abbey
by 1448: Sold to Ochsenhausen Abbey
1455: Sold to Rechberg-Hohenrechberg
1460: To Rechberg-Kronburg
1577: To Rechberg-Osterberg
1679: Sold to Meyer von Röfingen auf Bühl who assumed the name Osterberg
1712: HRE Barony
1806: To Bavaria
Öttingen
See: Oettingen
OttobeurenAbbacySwabSP764: Formed
1299: Imperial immediacy
1624: Fief of the Bishopric of Augsburg
1710: Imperial immediacy
1802: To Bavaria
OverijsselLordshipBurgn/a11th Century: Territory nominally ceded to the Bishopric of Utrecht as the Oversticht
1336: To Guelders
1347: To the Bishopric of Utrecht
1528: To the Spanish Netherlands; Burgundian Circle
1580: To the Netherlands
1795: To the Batavian Republic
1810: To France
1815: To the Netherlands