Adolphe became Duke of Nassau in August 1839, following the death of his fatherWilliam. The Duchy was annexed to Prussia after Austria's defeat in theAustro-Prussian War. From 1815 to 1839, theGrand Duchy of Luxembourg was ruled by thekings of the Netherlands as a province of theNetherlands. Following theTreaty of London (1839), the Grand Duchy became independent but remained in personal union with theNetherlands. Following the death of his sons, the Dutch king William III had no male heirs to succeed him. In the Netherlands, females were allowed to succeed to the throne. Luxembourg, however, followedSalic law which barred females from succession. Thus, upon King William III's death, the crown of the Netherlands passed to his only daughter,Wilhelmina, while that of Luxembourg passed to Adolphe in accordance with theNassau Family Pact. Adolphe died in 1905 and was succeeded by his son,William IV.
Adolphe becameDuke of Nassau in August 1839 at the age of 22, after the death of his father.Wiesbaden had by this time become the capital of the Duchy, and Adolphe took up residence in the newly constructedStadtschloss in 1841. On 4 March 1848 he consented to the population of Nassau's nine "Demands of the Nassauers". A few years later, however, he revoked his liberal views and took a strongly conservative and reactionary course. In general, though, he was seen as a popular ruler. He supported theAustrian Empire in theAustro-Prussian War of 1866. After Austria's defeat, Nassau was annexed to theKingdom of Prussia and he lost his throne on 20 September 1866.
In 1879, Adolphe's nieceEmma of Waldeck and Pyrmont, the daughter of another of his half-sisters, marriedWilliam III, King of the Netherlands and Grand Duke of Luxembourg. In 1890, upon William's death without surviving male issue, their only daughterWilhelmina succeeded to the Dutch throne, but was excluded from the succession to Luxembourg. The Grand Duchy, which had been linked to the Netherlands inpersonal union since 1815, passed to Adolphe in accordance with theNassau Family Pact.
Adolphe was King-Grand Duke William III's 17th cousin once removed through a male-only line[citation needed], but was also his 3rd cousin as they both descended fromWilliam IV, Prince of Orange (he being the paternal great-grandson of William IV's eldest daughterPrincess Carolina of Orange-Nassau). He had, in fact, taken over the regency of Luxembourg for a short time during William III's illness.
Adolphe was already 73 years old by this time and knew little of Luxembourgish politics. He mostly abstained from day-to-day governing; Prime MinisterPaul Eyschen, in office since 1888, took care of the affairs of state. This established a convention that the monarch would remain absent from the politics of the day, despite being vested with considerable reserve powers on paper. In 1902 Adolphe appointed his son William as Lieutenant-Representative.
On 23 April 1851, he remarried toPrincess Adelheid-Marie of Anhalt-Dessau. They had five children, of whom only two lived to the age of eighteen and became prince and princess of Luxembourg:
In 1892, Grand Duke Adolphe conferred the personal title ofPrince Bernadotte in the nobility of Luxembourg as well as the hereditary title ofCount of Wisborg[2] on his Swedish nephew,Oscar, who had lost his Swedish titles after marrying without his father's approval. Wisborg (also spelledVisborg) is the ruins of an old castle in the city ofVisby within Oscar's former Dukedom of Gotland, but the title itself was created in the nobility of Luxembourg.
On April 20, 1842, theAdelsverein,Society for the Protection of German Immigrants in Texas, was organised in the Grand Duke's castle atBiebrich on theRhine. He was named the Protector of the organisation. The Verein was responsible for the large emigration of Germans toTexas in the 19th century, and on January 9, 1843, established the 4,428 acreNassau Plantation inFayette County, Texas and named it after the Grand Duke.[3][4]
^Adolphenever abandoned his claim to the ducal title, which was passed on his death to his heir, William, and continued to be used as a secondary title by his successors as head of the House of Nassau-Weilburg.
^Roger Lundgren inSibylla en biografiBonniers StockholmISBN9789100111120 p. 62, specifically naming both the noble titles as created then
^King, Irene Marschall (1967).John O.Meusebach. University of Texas Press. p. 33.ISBN978-0-292-73656-6.
^Garrett, Daphne Dalton."Nassau Farm".Handbook of Texas Online. Texas State Historical Association.Archived from the original on 30 November 2010. Retrieved29 December 2010.
^Staatshandbücher für das Herzogtum Sachsen-Coburg und Gotha (1843), "Herzogliche Sachsen-Ernestinischer Hausorden" p.6
^Hof- und Staats-Handbuch des Großherzogtum Baden (1841), "Großherzogliche Orden" pp.29,44
^Liste der Ritter des Königlich Preußischen Hohen Ordens vom Schwarzen Adler (1851), "Von Seiner Majestät dem Könige Friedrich Wilhelm III. ernannte Ritter"p. 21