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Luxembourg: Polity Style: 1815-2024

13 Feb 1815 part of the territories of the former Duchy of Luxembourg is designated for cession to the Sovereign Prince of the United Netherlands to form a member state of the German Confederation (Deutscher Bund) in accordance with the articles agreed by the plenipotentiaries of the Great Powers in Vienna on 13 Feb 1815 (Chodźko 1864, 2:774-775) [1]
16 Mar 1815 the establishment of the Kingdom of the Netherlands and assumption of the titles of the King of the Netherlands and the Duke of Luxembourg is proclaimed by a declaration of the Sovereign Prince of the United Netherlands issued in The Hague on 16 Mar 1815 (Nederlandse Staatscourant, No. 65, 17 Mar 1815, p. 1; Luxembourg Official Gazette, No. 39, 25 May 1815, pp. 389-392)
23 Mar 1815 the assumption of the title of the King of the Netherlands by the Sovereign Prince and the proposal to assume the title of Grand Duke of Luxembourg are agreed by the plenipotentiaries of the Great Powers in Vienna on 23 Mar 1815 (the minutes of the meeting were approved on 24 Mar 1815) (Chodźko 1864, 2:952-953)
7 Apr 1815 the recognition of the titles of the King of the Netherlands and the Grand Duke of Luxembourg by the Great Powers is announced in a notice signed by the plenipotentiaries of the Great Powers, announcement of the ministry of foreign affairs of the Netherlands of 6 Apr 1815 (Nederlandse Staatscourant, No. 83, 7 Apr 1815, p. 1)
12 May 1815 the lands designated for cession to the King of the Netherlands and the Grand Duke of Luxembourg are formally transferred by a proclamation of the Commissioner General of the King of the Netherlands issued in Liège on 12 May 1815 (Luxembourg Official Gazette, No. 39, 25 May 1815, pp. 392-394)
12 May 1815 - Grand-Duché de Luxembourg :: Großherzogtum Luxemburg :: (from 24 Feb 1984) Groussherzogtum Lëtzebuerg

[1] The cession is confirmed by the Final Act of the Congress of Vienna signed on 9 Jun 1815. Ratifications: Russia (2/14 Sep 1815, Paris); Sweden (1 Nov 1815, Stockholm); Prussia (12 Nov 1815, Berlin); Austria (7 Dec 1815, Venice); France (7 Dec 1815, Paris); Great Britain (11 Dec 1815, London); Portugal (4 Mar 1816, Rio de Janeiro). Exchange of ratifications: Great Britain (1 Feb 1816, London); France (6 Feb 1816, Paris); Russia (25 Feb 1816, Vienna); Prussia (7 Apr 1816, Paris); Sweden (2 Jul 1816, Paris); Portugal (3 Jul 1816, Paris). The King of the Netherlands ratified the Final Act on 10 Jan 1816 (exchange of ratifications on 31 Aug 1816) (Acte du congrès de Vienne (1815) online; AT-OeStA/HHStA UR AUR ad 1815 VI 9 1 Signatarstaaten des Wiener Kongresses (Frankreich, Großbritannien, Österreich, Portugal, Preußen, Russland, Schweden), 1815.09.02-1816.03.04 online; Bittner 1903, 2:120-121).