The House of Isenburg was an old aristocratic family of medieval Germany, named after the castle of Isenburg in North Rhine-Westphalia. Occasionally referred to as the House of Rommersdorf before the 12th Century, the house originated in the Hessian comitatus of the Niederlahngau in the 10th Century. It partitioned into the lines of Isenburg-Isenburg and Isenburg-Limburg-Covern in 1137, before partitioning again into smaller units, but by 1500 only the lines of Isenburg-Büdingen (in Upper Isenburg) and Lower Isenburg remained.
In 1664 the Lower Isenburg branch died out. The Büdingen line continued to partition, and by the beginning of the 19th Century the lines of Isenburg-Büdingen, Isenburg-Birstein, Isenburg-Meerholz and Isenburg-Wächtersbach existed. The Principality of Isenburg was created in 1806 when the princely Birstein line mediatised the comital others, and the principality itself was mediatised in 1814 by the Congress of Vienna with its territories annexed to the Grand Duchy of Hesse.
States of the House of Isenburg[]
Niederlahngau 966 - 1137 | ||||||||||||||||||
Isenburg-Limburg-Covern 1137 - 1158 |
Isenburg-Isenburg 1137 - 1199 | |||||||||||||||||
Isenburg-Covern 1158 - 1306 |
Isenburg-Grenzau 1158 - 1290 |
Lower Isenburg 1218 (1199) - 1503 |
Isenburg-Braunsberg 1210 (1199) - 1388 renamed Isenburg-Wied 1388 | |||||||||||||||
Isenburg-Limburg 1220 - 1365 |
Isenburg-Cleberg 1286 - 1311 |
Isenburg-Arnfels 1286 - 1379 |
Isenburg-Wied 1388 - 1454 superseded by Wied 1454 | |||||||||||||||
Isenburg-Grenzau 1371 - 1439 |
Isenburg-Büdingen 1371 - 1511 |
Isenburg-Neumagen 1502 - 1554 |
Isenburg-Grenzau 1502 - 1664 | |||||||||||||||
Isenburg-Rönneburg 1511 - 1601 |
Isenburg-Büdingen-Birstein 1511 - 1628 |
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Isenburg-Büdingen 1628 - 1806 |
Isenburg-Birstein 1628 - 1664 |
Isenburg-Offenbach 1628 - 1711 | ||||||||||||||||
Isenburg-Meerholz 1673 - 1806 |
Isenburg-Wächtersbach 1673 - 1806 |
Isenburg-Birstein 1685 - 1806 |
Isenburg-Eisenberg 1711 - 1758 cadet branch |
Isenburg-Philippseich 1711 - 1806 cadet branch | ||||||||||||||
Isenburg 1806 - 1815 |