Philippe François, 1st Duke of Arenberg
Philippe François de Ligne, (30 July 1625 - 17 December 1674), 7th Duke of Aarschot, 1st Duke of Arenberg, a Knight of the Order of the Golden Fleece, was the first son of the second marriage of Philippe Charles, Comte d'Arenberg and Isabelle Claire de Berlaymont.
On 14 July 1642 Philippe François married 15-year-old Magdalena de Borja y Doria, the elder sister of Ana Francisca de Borja y Doria.
In 1646, aged 21, Philipe was made a Knight of the Order of the Golden Fleece.
Their children:
1 François of Arenberg (5 September 1643 - 10 September 1643).
2 Isabelle Claire Eugénie of Arenberg (12 July 1644 - 5 October 1655).
When he died in December 1674, the title passed to his half-brother, Charles Eugene, Duke of Arenberg, (1633–1681), who was promoted to become a Knight of the Order of the Golden Fleece in 1678.
Louis Engelbert, 6th Duke of Arenberg
Louis Engelbert of Arenberg( August 3, 1750 in Brussels – March 7, 1820 in Brussels), nicknamed" the blind duke", was between 1778 and 1801 the sixth Duke of Arenberg and 12th Duke of Aarschot.
Between 1803 and 1810 he ruled a Duchy in North- western Germany also called Duchy of Arenberg.
He was born in Brussels as son of Charles Marie Raymond of Arenberg, one of the most prominent nobles in the Austrian Netherlands, and Louise Margaret von der Mark und Schleide.
At the age of 24, during a hunting party, he was hit in the face by a shotgun and remained blind for the rest of his life.
Unable to pursue the usual military career, he turned to science, art and music .< br>
Under his patronage, the first manned gas- filled balloon flight in history took off from the front lawn of the Arenberg Castle on November 21, 1783; the balloonist was professor Jan Pieter Minckeleers.
At the beginning of the French Revolution, he succeeded in keeping his possessions, but when Bonaparte annexed the Rhineland, he lost most of his territories.
In the Reichsdeputationshauptschluss of 1803 though, he was compensated with Recklinghausen and Meppen, together also named the Duchy of Arenberg.
In 1810 he abdicated in favor of his son Prosper Louis.
Louis Engelbert was named senator by Napoleon and a count of the First French Empire.
After 1815, he returned to Belgium, where the Duchy of Arenberg was restored to the family by the Congress of Vienna, be it without the sovereignty of before.
Engelbert, 8th Duke of Arenberg
Engelbert August Anton of Arenberg
(Brussels, 11 May 1824 – Arenberg Castle, 28 March 1875) was 8th Duke of Arenberg and 14th Duke of Aarschot.
He was the son of Prosper Louis, 7th Duke of Arenberg, and belonged to one of the most important European noble families.
He was Duke of Arenberg, Duke of Aarschot, Duke of Meppen and Prince of Recklinghausen.
In 1868, he married his second cousin Eleonore Ursula d'Arenberg (1845 - 1919).
They had three daughters and two sons:
The Arenberg Foundation describe him as a great patron of the arts.
He was the last Duke of Arenberg to hold possessions in Germany.
These were lost in the German Unification.
In 1861 he became a member of the Prussian House of Lords.
Charles Lennox, 2nd Duke of Richmond
Charles Lennox, 2nd Duke of Richmond, 2nd Duke of Lennox, 2nd Duke of Aubigny,( 18 May 17018 August 1750) was a British nobleman, peer, and politician.
He was the son of Charles Lennox, 1st Duke of Richmond, an illegitimate son of King Charles II.
He held a number of posts in connection with his high office but is best remembered for his patronage of cricket.
He has been described as the most important of the sport's early patrons and did much to help its evolution from village cricket to first- class cricket.
Prosper Louis, 7th Duke of Arenberg
Prosper Louis, 7th Duke of Arenberg( 28 April 1785, Enghien – 27 February 1861) was the Duke of Arenberg, a principality of the Holy Roman Empire.
He was also the 13th Duke of Aarschot, 2nd Duke of Meppen and 2nd prince of Recklinghausen.
In 1801, Louis Engelbert, Duke of Arenberg, Prosper's father, lost the former Duchy of Arenberg on the left bank of the Rhine but received a larger duchy on the right bank in 1803.
In 1808 Arenberg married Stéphanie Tascher de La Pagerie a niece of Joséphine de Beauharnais( Empress of the French Empire).
His wife was given the present Hôtel de Chimay, known as the" Hôtel de La Pagerie" in Paris in 1808.
He was granted new lands by Joséphine's husband Napoleon Bonaparte( expanding his holdings from 413 km² to 3,388 km²) and gained the additional titles of Duke of Meppen and Prince of Recklinghausen.
He lost his sovereignty over his lands in 1810 when Arenberg was mediatised into France but retain the style of HSH(" His Serene Highness"), which is still used by his descendant.
Arenberg was colonel of the Belgian Chevau- Légers d' Arenberg which fought in the Peninsular War and was wounded captured by the British at the Battle of Arroyo dos Molinos on 28 October 1811.
Arenberg took no part in the 1815 Waterloo Campaign other than to attend the Duchess of Richmond's ball, but his contacts among the British did not save his lands which were lost when they were overrun by the Prussians and the Hanoverians.
In 1816 he divorced his first wife and married again in 1819 to Princess Maria- Ludmille de Lobkowicz.
Maria- Ludmille and Arenberg had seven children, the third eldest and the first boy Engelbert Auguste, inherited his father's titles becoming the 8th Duke of Arenberg.
Charles Eugene, 2nd Duke of Arenberg
Charles Eugene, 2nd Duke of Arenberg (1633–1681), a Knight of the Order of the Golden Fleece since 1678, became 2nd Duke of Arenberg in 1674 on the death of his half-brother Philippe François, 1st Duke of Arenberg.
The original title had been awarded on 6 June 1644, by Habsburg Emperor Ferdinand III, Holy Roman Emperor, making the principality of Arenberg a dukedom of the Austrian Empire..
He married Marie-Henriette de Cusance, marquise de Varambon in 1660.
Their two sons Philippe Charles François, 3rd Duke of Arenberg and Alexandre, fell in battle in 1691 and 1683 respectively.
He was Grand-Bailli and Capitaine-Général of Hainaut.
Philippe Charles d'Arenberg
Philippe Charles François, 3rd Duke of Arenberg( 10 May 1663—25 August 1691) was also the 9th Duke of Aarschot.
He became a knight of the Order of the Golden Fleece in 1685.
Like his father, Charles Eugene, 2nd Duke of Arenberg, he was Grand- Bailiff and Captain- General of Hainaut.
The youngest general in the imperial army at the Battle of Slankamen( in modern- day Vojvodina, Serbia), he died from his wounds on August 19, 1691.
He married Maria Enrichetta del Carretto, Marchesa de Grana e Savona in Italy, in 1684.
He was succeeded by their son, Leopold Philippe d' Arenberg, as the 4th Duke of Arenberg, whose descendants include the current line of the Prince- Dukes d' Arenberg, as well as Empress Elisabeth of Austria and Albert I, King of the Belgians.
His daughter Marie Anne( 1689- 1736) married François Egon de La Tour, Count d' Auvergne and Margrave of Berg- op- Zoom, a French" prince étranger" and nephew of the Marshal of France Turenne.
Marie Anne's daughter Marie Henriette de La Tour d' Auvergne, Margravine of Berg- op- Zoom married John Christian, Count Palatine of Sulzbach, and was the mother of Charles Theodore, Elector of Bavaria.
Auguste Marie Raymond d'Arenberg
Prince Auguste Marie Raymond d'Arenberg, Count of La Marck Grandee of Spain (30 August 1753 – 26 September 1833), was the second son and fourth child of Charles, 5th Duke of Arenberg, the head of the House of Arenberg (and who still held the rank of sovereign princes).
Léopold Philippe d'Arenberg
Leopold Philippe of Arenberg (October 14, 1690 – March 4, 1754) was the 4th Duke of Arenberg, 10th Duke of Aarschot and an Austrian Field Marshal.
Edmond de Talleyrand-Périgord
Edmond de Talleyrand- Périgord, 2nd Duke of Talleyrand, 2nd Duke of Dino( 1 August 1787, Paris – 14 May 1872, Florence), was a French general of the Napoleonic Wars.

Question: Who is Charles Eugene, 2Nd Duke Of Arenberg's sibling-in-law?
Answer: Magdalena de Borja y Doria