|County (Duchy) of Arenberg|
|Grafschaft (Herzogtum) Arenberg|
|State of the Holy Roman Empire, then|
State of the Confederation of the Rhine
The Duchy of Arenberg in 1807.
|Historical era||Middle Ages|
|•||County established||ca 1177|
|•||Raised to Princely county||1576|
|•||Joined Council of Princes||1580|
|•||Raised to Duchy||1644|
of the Rhine
|•|| Mediatised to Hanover
|•||1798||413 km² (159 sq mi)|
|Density||35.8 /km² (92.8 /sq mi)|
The territorial possessions of the dukes of Arenberg varied through the ages. Around 1789 the duchy was located in the Eifel region on the west side of the Rhine, and contained amongst others Aremberg, Schleiden and Kerpen.
The pre-Napoleonic duchy had an area of 413 km² and a population of 14,800. It belonged to the Electoral Rhenish Circle, and was bordered by the duchy of Jülich, the Archbishopric of Cologne, the Archbishopric of Trier, and the county of Blankenheim.
After the French occupation of the west bank of the Rhine around 1798 (see Treaty of Campo Formio and Treaty of Lunéville) the duke of Arenberg received new lands: the county of Vest Recklinghausen, the county of Meppen, and the lordship of Dülmen.
Arenberg joined Napoleon's Confederation of the Rhine, although that did not prevent it being mediatised in 1810, with France annexing Dülmen and Meppen, and the duchy of Berg annexing Recklinghausen.
After Napoleon's defeat in 1814 and the dissolution of the Confederation of the Rhine the former Arenberg territories were divided between the kingdom of Prussia and the kingdom of Hanover. Both in Prussia and Hanover, the dukes became local peers subordinate to the king.
In 1826, the Arenberg territory in Hanover was named duchy of Arenberg-Meppen. Arenberg-Meppen had an area of 2,195 km² and a population of 56,700. The county of Recklinghausen, in Prussia, had an area of 780 km² and a population of 64,700.
The dukes of Arenberg remain a prominent Belgian aristocratic family. The direct family of the reigning duke are called by the nominal title of prince of Arenberg. The ducal family descends agnatically from the House of Ligne.
Counts, Princely Counts and Dukes
Counts of Arenberg (1117–1576)
- Franko (1117–1129)
- Henry I (1136–1187)
- Eberhard I (1188–1202)
- Eberhard II (1202–1229)
- Henry II (1220–1250)
- Gerard (1252–1260)
- John I (1260–1279)
- Mathilde (1282–1299)
- Eberhard (Count of Marck) (1282–1308)
- Eberhard I (III) (1308–1387)
- Eberhard II (1387–1454)
Partition into Arenberg and Rochefort
- John II (1454–1480)
- Eberhard III (1480–1496)
- Eberhard IV (1496–1531)
- Robert I (1531–1541)
- Robert II (?–1536)
- Robert III (1541–1544)
- Margaret (1544–1576)
- John III (1547–1568)
- Charles (1568–1576)
Princely Counts of Arenberg (1576–1645)
Dukes of Arenberg (1645–1810)
- Philippe François, 1st Duke of Arenberg (1645–1675)
- Charles Eugene, 2nd Duke of Arenberg (1675–1681)
- Philip Charles Francis, 3rd Duke of Arenberg (1681–1691)
- Leopold, 4th Duke of Arenberg (1691–1754)
- Charles Marie Raymond, 5th Duke of Arenberg (1754–1778)
- Louis Engelbert, 6th Duke of Arenberg (1778–1803)
- Prosper Louis, 7th Duke of Arenberg (1803–1810)
Non-reigning dukes of Arenberg (1810–present)
- Prosper Louis, 7th Duke of Arenberg (1810–1861)
- Engelbert Auguste, 8th Duke of Arenberg (1861–1875)
- Engelbert-Marie, 9th Duke of Arenberg (1875–1949)
- Engelbert-Charles, 10th Duke of Arenberg (1949–1974)
- Erik Engelbert, 11th Duke of Arenberg (1974–1992)
- Jean Engelbert, 12th Duke of Arenberg (1992–2011)
- Léopold, 13th Duke of Arenberg (2011–present)