Landgrave of Hesse-Kassel 1567-1803
King of Sweden 1720-1751
William IV (1532 – 1592) Landgrave of Hesse-Kassel
- William IV (1532 – 1592) Landgrave of Hesse-Kassel, eldest son of Philip “the Magnanimous” (1504-1567) Landgrave of Hesse. Married Sabine of Württemberg (1549 – 1581) daughter of Christopher, Duke of Württemberg
Maurice (1572 – 1632) Landgrave of Hesse-Kassel
- Maurice (1572 – 1632) Landgrave of Hesse-Kassel. Married firstly Agnes of Solms-Laubach (1578 –1602) daughter of Count John George of Solms-Laubach and secondly Juliane of Nassau--Siegen (1587 – 1643) daughter of John VII, Count of Nassau-Siegen.
William V (1602 – 1637) Landgrave of Hesse-Kassel
- William V (1602 – 1637) Landgrave of Hesse-Kassel. Married Amalie Elisabeth of Hanau-Münzenberg (1602–1651) daughter of Philip Louis II, Count of Hanau-Münzenberg.
William VI (1629 – 1663) Landgrave of Hesse-Kassel
- William VI (1629 – 1663) Landgrave of Hesse-Kassel. Married Hedwig Sophie of Brandenburg (1623–1683) daughter of George William, Elector of Brandenburg.
- William VII (1651 - 1670) Landgrave of Hesse-Kassel.
Charles (1654 – 1730) Landgrave of Hesse-Kassel
- Charles (1654 – 1730) Landgrave of Hesse-Kassel. Married Maria Amalia of Courland (1653–1711) daughter of Jacob Kettler, Duke of Courland.
Frederick I (1676 –1751) Landgrave of Hesse-Kassel and King of Sweden
- Frederick I (1676 –1751) Landgrave of Hesse-Kassel, Prince consort of Sweden from 1718 to 1720 and King of Sweden from 1720. Founder of the Order of the Seraphim and the Order of the Sword and the Order of the Polar Star in 1748. Married firstly Luise Dorothea of Prussia (1680 – 1705) daughter of Frederick I, King in Prussia and secondly Ulrika Eleonora (1688 – 1741) Queen regnant of Sweden.
William VIII (1682 – 1760) Landgrave of Hesse-Kassel
- William VIII (1682 – 1760) Landgrave of Hesse-Kassel, de facto ruler of Hesse-Kassel after 1730. Knight of the Order of the White Eagle. Married Dorothea Wilhelmina (1691 –1743) daughter of Maurice William, Duke of Saxe-Zeitz. In 1736, the county of Hanau-Münzenberg went to Hesse-Kassel after the death Johann Reinhard III (1665 – 1736) the last of the Count of Hanau-Lichtenberg and Hanau-Münzenberg.
Frederick II (1720 – 1785) Landgrave of Hesse-Kassel
- Frederick II (1720 – 1785) Landgrave of Hesse-Kassel, Founder and Grandmaster of the House-order of the Golden Lion in 1770. Founder and Grandmaster of the Pour la vertu militaire in 1769. Knight of the Order of the Black Eagle. Knight of the Garter. Married firstly Princess Mary of Great Britain (1723 – 1772) daughter of George II, King of Great Britain and Ireland and secondly Philippine Auguste Amalie of Brandenburg-Schwedt (1745 – 1800) daughter of Frederick William, Margrave of Brandenburg-Schwedt.
- William IX (I) (1743 – 1821) Landgrave of Hesse-Kassel later Elector of Hesse. See below
Elector of Hesse 1803-1875
1866 annexed by Prussia
William I (1743 – 1821) Elector of Hesse
- William I (IX) (1743 – 1821) Landgrave of Hesse-Kassel and Elector of Hesse from 1803 to 1806 and from 1813. 1806 annexed by the Kingdom of Westphalia, 1813 restored. Grandmaster of the House-order of the Golden Lion. Grandmaster of the Pour la vertu militaire. Founder and Grandmaster of the Order of the Iron Helmet in 1814. Knight of the Order of the Black Eagle. Knight of the Order of the White Elephant. Knight of the Garter. Married Princess Wilhelmina Caroline of Denmark and Norway (1747 – 1820) daughter of Frederick V, King of Denmark and Norway.
William II (1777 – 1847) Elector of Hesse
- William II (1777 – 1847) Elector of Hesse. Grandmaster of the House-order of the Golden Lion. Grandmaster of the Pour la vertu militaire. Grandmaster of the Order of the Iron Helmet. Knight of the Order of St. Andrew. Knight of the Order of the Black Eagle. Knight of the White Elephant. Married firstly Princess Augusta of Prussia (1780 – 1841) daughter of Frederick William II, King of Prussia, secondly morganatically Emilie Ortlöpp (1791–1843) created Countess of Reichenbach-Lessonitz in 1821, daughter of Johann Christian Ortlöpp and thirdly also morganatically Caroline, Baroness of Berlepsch (1820–1877) created Countess of Bergen in 1846, daughter of Ludwig Hermann, Baron of Berlepsch.
Frederick William I (1802 – 1875) Elector of Hesse
- Frederick William I (1802 – 1875) Elector of Hesse until 1866. Grandmaster of the House-order of the Golden Lion. Grandmaster of the Pour la vertu militaire. Grandmaster of the Order of the Iron Helmet. Knight of the Order of St. Andrew. Knight of the Order of the Black Eagle. Married morganatically Gertrude Falkenstein (1803 – 1882) created Countess of Schaumburg in 1831 and Princess of Hanau and to Horowitz in 1853, daughter of Johann Gottfried Falkenstein. Their sons were Counts von Schaumburg and later Princes of Hanau.
Landgrave of Hesse-Kassel-Rumpenheim
1785-1875
Landgrave (Elector) of Hesse-Kassel
1875-present
King of Finland
1918
Frederick (1747 – 1837) Landgrave of Hesse-Kassel-Rumpenheim
- Frederick (1747 – 1837) Landgrave of Hesse-Kassel-Rumpenheim, younger son of Frederick II (1720 – 1785) Landgrave of Hesse-Kassel. Knight of the Royal Order of the Seraphim. Knight of the House-order of the Golden Lion. Knight of the Pour la vertu militaire. Knight of the Royal Guelphic Order. Knight of the Order of Philip the Magnanimous. Married Princess Caroline of Nassau-Usingen (1762 – 1823) daughter of Karl Wilhelm, Prince of Nassau-Usingen
Wilhelm I (1787–1867) Landgrave of Hesse-Kassel-Rumpenheim
- Wilhelm I (1787–1867) Landgrave of Hesse-Kassel-Rumpenheim. Knight of the White Elephant. Knight of the Order of the Dannebrog. Married Princess Louise Charlotte of Denmark (1789–1864) daughter of Hereditary Prince Frederick of Denmark and Norway.
Frederick William (II) (1820 – 1884) Landgrave of Hesse-Kassel
- Frederick William (II) (1820 – 1884) Landgrave of Hesse-Kassel. Succeeded, as titular Prince-elector of Hesse after the death of Frederick William I (1802 – 1875) Elector of Hesse. Knight of the White Elephant. Knight of the Order of St.Andrew. Knight of the Order of the Black Eagle. Knight of the Order of the Seraphim. Married firstly Alexandra Nikolaevna of Russia (1825–1844) daughter of Nicholas I, Emperor of Russia and secondly Princess Anna of Prussia (1836–1918) daughter of Prince Charles of Prussia.
- Frederick William (III) (1854 – 1888) Landgrave of Hesse-Kassel.
- Alexander Friedrich (1863–1945) Landgrave of Hesse-Kassel 1888–1925 abdicated.
- Frederick Charles Louis Constantine (1868 –1940) Landgrave of Hesse-Kassel. Elected King of Finland as Fredrik Kaarle I in 1918.
- Philipp (1896 – 1980) Landgrave of Hesse. Head of House of Hesse in 1968 on extinction of Hesse-Darmstadt line.
- Moritz (1926 – 2013) Landgrave of Hesse. Head of House of Hesse.
- Donatus (b.1966) Landgrave of Hesse. Head of House of Hesse.