This is a list of states in the Holy Roman Empire beginning with the letter I. Some historians mark the beginning of the Empire as 800, with the coronation of Frankish king Charlemagne ("Charles the Great").
Name Type Imperial circle Imperial diet History Inner Austria Duchy 1379: Partitioned from Austria1406: Annexed to Austria Irsee Abbacy Swab SP 1186: Formed1695: Imperial immediacy1802: To Bavaria Isenberg-Limburg County n/a n/a 1253: Renamed from Altena-Isenberg1289: Acquired Altenhof and Styrum1304: Partitioned into Limburg-Hohenlimburg and Limburg-Styrum IsenburgHRE Prince of Isenburg Lordship n/a n/a 11th Century: Counts of the Niederlahngau assumed the name Isenburg though without comital rank1129: Acquired Kobern1137: Partitioned into Isenburg-Kobern and Isenburg-Isenburg1197: Rembold IV acquired Kempenich, founding Isenburg-Kempenichc1100: Division into Isenburg-Limburg and Isenburg-Kempenich1137: Partitioned into Isenburg-Isenburg and Isenburg-Limburg-Covern1673: Division into Isenburg, Birstein, Isenburg-Marienborn, Isenburg-Meerholz, Isenburg-Wachtersbach1806: Joined Confederation of the Rhine Isenburg-Arenfels Lordship n/a n/a 1280: Partitioned from Isenburg-Cleeberg1371: Extinct; to Isenburg-Isenburg Isenburg-Birstein County1744: Principality Upp Rhen WT 1511: Partitioned from Isenburg-Büdingen1628: Partitioned into Isenburg-Offenbach and Isenburg-Büdingen1685: Partitioned from Isenburg-Offenbach1744: HRE Prince1803: Bench of Princes1806: Renamed to Principality of Isenburg and mediatised the other branches of the House of Isenburg1815: To the Grand Duchy of Hesse; renamed to Ysenburg and Büdingen Isenburg-Braunsberg Lordship n/a n/a 1175: Partitioned from Isenburg-Isenburg1243: Renamed to Isenburg-Wied after inheriting Wied Isenburg-Büdingen Lordship1442: County n/a n/a 1341: Partitioned from Isenburg-Cleeberg1442: HRE Count1511: Partitioned into Isenburg-Rönneburg and Isenburg-Birstein1628: Partitioned from Isenburg-Birstein1673: Partitioned into itself, Isenburg-Wächtersbach, Isenburg-Meerholz and Isenburg-Marienborn1806: To Isenburg-Birstein1815: To the Grand Duchy of Hesse Isenburg-Cleeberg (Isenburg-Cleberg) Lordship n/a n/a 1158: Partitioned from Isenburg-Kobern1221: Acquired Limburg an der Lahn1258: Partitioned into itself and Isenburg-Limburg 1280: Partitioned into Isenburg-Arenfels and itself1304: Acquired Büdingen1310: Acquired Grenzau1341: Partitioned into Isenburg-Büdingen and Isenburg-Grenzau Isenburg-Eisenberg County n/a n/a 1685: Partitioned from Isenburg-Offenbach1758: Extinct; to Isenburg-Birstein Isenburg-Grenzau Lordship n/a n/a 1341: Partitioned from Isenburg-Cleeberg1439: Extinct; to Nassau-Beilstein1446: To the Archbishopric of Trier1460: To Isenburg-Isenburg (Lower Isenburg) Isenburg-Grenzau Lordship n/a n/a 1502: Partitioned from Isenburg-Isenburg (Lower Isenburg)1664: Extinct; divided between the Archbishoprics of Cologne and Trier and Fulda Abbey, with the latter granting their share of the territory to Walderdorff Isenburg-Isenburg (Lower Isenburg) Lordship n/a n/a 1137: Partitioned from Isenburg 1175: Partitioned into itself and Isenburg-Braunsberg1197: Acquired Kempenich 1220: Partitioned into itself and Isenburg-Kempenich1460: Acquired Grenzau1497: Acquired Neumagen1502: Partitioned into Isenburg-Grenzau and Isenburg-Neumagen Isenburg-Kempenich Lordship n/a n/a 1277: Made fief of the Archbishopric of Trier1424: Extinct; to Schöneck Isenburg-Kobern (Isenburg-Covern) Lordship n/a n/a 1137: Partitioned from Isenburg 1158: Partitioned into itself and Isenburg-Cleeberg1195: Made fief of the Archbishopric of Trier1266: Extinct; to Neuerburg Isenburg-Limburg Lordship n/a n/a 1258: Partitioned from Isenburg-Cleeberg1406: Extinct; to the Archbishopric of Trier Isenburg-Marienborn Lordship1442: County Upp Rhen n/a 1673: Partitioned from Isenburg-Büdingen1725: Extinct; divided between Isenburg-Büdingen, Isenburg-Wächtersbach and Isenburg-Meerholz Isenburg-Meerholz Lordship1442: County Upp Rhen n/a 1673: Partitioned from Isenburg-Büdingen1806: To Isenburg-Birstein1815: To the Grand Duchy of Hesse Isenburg-Neumagen Lordship n/a n/a 1502: Partitioned from Isenburg-Isenburg (Lower Isenburg)1554: Extinct; to Sayn-Wittgenstein Isenburg-Offenbach County Upp Rhen n/a 1628: Partitioned from Isenburg-Birstein1685: Partitioned into Isenburg-Philippseich, Isenburg-Birstein and Isenburg-Eisenberg Isenburg-Philippseich County Upp Rhen n/a 1685: Partitioned from Isenburg-Offenbach1718: Extinct; given as an appanage to his nephew William Maurice II, Count of Isenburg-Philippseich without imperial immediacy nor representation in the imperial diet Isenburg-Rönneburg County Upp Rhen n/a 1511: Partitioned from Isenburg-Büdingen1601: Extinct; to Isenburg-Birstein Isenburg-Wächtersbach Lordship1442: County Upp Rhen n/a 1673: Partitioned from Isenburg-Büdingen1806: To Isenburg-Birstein1815: To the Grand Duchy of Hesse Isenburg-Wied County n/a n/a 1243: Renamed from Isenburg-Braunsberg after inheriting Wied1462: Extinct; to Runkel Isny im Allgäu Imperial City Swab SW 1365: Free Imperial City1803: To Quadt1806: To Württemberg Istria Margraviate n/a n/a 1040: Given to Poppo of Weimar-Orlamünde, also of Carniola1173: To Andechs-Meran1209: To the Patriarchate of Aquileia13th Century: Most to Venice1374: To Austria as mediate province through Carniola1420: Rest of Istria to Venice1797: Venetian parts to Austria1805: To Italy1815: To Austria Itter Lordship
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