Belgium: Heads of State: 1830-1940 - Archontology
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Belgium: Heads of State: 1830-1940

Royal House: De Belgique = Van België (formerly Saxe-Cobourg et -Gotha = Saksen-Coburg en -Gotha); baptismal and civil birth names of the kings and regents are presumed to have been originally recorded in French and appear in parentheses following the regnal name(s); Dutch forms of the regnal names are given for the period after 1898 when it is different from French names.
Gouvernement provisoire de la Belgique
26 Sep 1830 - 25 Feb 1831 membership
Régent de la Belgique
25 Feb 1831 - 21 Jul 1831 Érasme-Louis, baron Surlet de Chokier
Roi des Belges
21 Jul 1831 - 10 Dec 1865 Léopold Ier (Léopold-Georges-Chrétien-Frédéric) [1]
Ministres réunis en Conseil (ex officio)
10 Dec 1865 - 17 Dec 1865 membership
Roi des Belges :: (from 25 May 1898) Koning der Belgen
17 Dec 1865 - 17 Dec 1909 Léopold II (Léopold-Louis-Philippe-Marie-Victor) [2][3]
Ministres réunis en Conseil :: Ministers in Raad vergaderd (ex officio)
17 Dec 1909 - 23 Dec 1909 membership
Roi des Belges :: Koning der Belgen
23 Dec 1909 - 17 Feb 1934 Albert (Albert-Léopold-Clément-Marie-Meinrad) [4]
Ministres réunis en Conseil :: Ministers in Raad vergaderd (ex officio)
17 Feb 1934 - 23 Feb 1934 membership
Roi des Belges :: Koning der Belgen
23 Feb 1934 - 27 May 1940 Léopold III :: Leopold III (Léopold-Philippe-Charles-Albert-Meinrad-Hubert-Marie-Miguel) [4]

[1] The regnal name in the executory formula in French was fixed by a royal order of 22 Jul 1831 as "Léopold Premier".
[2] The regnal name in the executory formula in French and Dutch was fixed by the law of 18 Apr 1898 (effective from 25 May 1898) as "Léopold II". In Dutch documents, it was normally substituted with "Leopold II".
[3] Also in Congo (Kinshasa)
[4] The regnal names in the executory formula were fixed by a royal order of 23 Dec 1909 as "Albert" (French) and "Albrecht" (Dutch). The name in Dutch was changed to "Albert" by a royal decree of 28 Dec 1909.