William IV, Landgrave of Hesse-Kassel

William IV
Landgrave of Hesse-Kassel
Portrait of William IV
Born	(1532-06-24)24 June 1532 Kassel
Died	25 August 1592(1592-08-25) (aged 60)
Noble family	Hesse-Kassel (founder) Hesse (by birth)
Spouse(s)	Sabine of Württemberg
Issue More...	Anna Maria, Countess of Nassau-Weilburg Hedwig, Countess of Schaumburg Maurice, Landgrave of Hesse-Kassel Christine, Duchess of Saxe-Eisenach
Father	Philip I, Landgrave of Hesse
Mother	Christine of Saxony

William IV of Hesse-Kassel (24 June 1532 – 25 August 1592), also called William the Wise, was the first Landgrave of the Landgraviate of Hesse-Kassel (or Hesse-Cassel). He was the founder of the oldest line, which survives to this day.

Life

Landgrave

William was born at Kassel, the eldest son of Landgrave Philip the Magnanimous and Christine of Saxony. After his father's death in 1567, the Landgraviate of Hesse was divided between the four sons out of the late Landgrave of Hesse's first marriage, and William received the portion around the capital Kassel, the Landgraviate of Hesse-Kassel.

William took a leading part in safeguarding the Lutheran Reformation, and was indefatigable in his endeavours to unite the different sections of Protestantism against Catholicism. However, he was reluctant to use military force in this conflict.

As an administrator he displayed rare energy, issuing numerous ordinances, appointing expert officials, and in particular ordering his slender finances. By a law of primogeniture he secured his Landgraviate's land against such testamentary divisions as had diminished his father's estate.

Astronomical work

William is most notable for his patronage of the arts and sciences. As a youth he had cultivated close connections with scholars and as a ruler he kept up this connection. His interest in astronomy may have been inspired by Petrus Apianus's Astronomicum Caesareum.

William was a pioneer in astronomical research, and perhaps owes his most lasting fame to his discoveries in this branch of study. Most of the mechanical contrivances which made instruments of Tycho Brahe so superior to those of his contemporaries were adopted in Kassel about 1584. From then on the observations made in Hesse-Kassel seem to have been about as accurate as those of Tycho. However the resulting longitudes were 6' too great in consequence of the adopted solar parallax of 3'.

Hessian star catalogue

The principal product of the astronomical observations was the Hessian star catalogue, a catalogue of about a thousand stars. The locations were determined by the methods usually employed in the 16th century, connecting a fundamental star by means of Venus with the sun, and thus finding its longitude and latitude, while other stars could at any time be referred to the fundamental star. It should be noticed that clocks, on which Tycho depended very little, were used at Kassel for finding the difference of right ascension between Venus and the sun before sunset. Tycho preferred observing the angular distance between the sun and Venus when the latter was visible in the daytime.

The Hessian star catalogue was published in Historia coelestis (Augsburg, 1666) by Albert Curtz, and a number of other observations are to be found in Coeli et siderum in eo errantium observationes Hassiacae (Leiden, 1618), edited by Willebrord Snell.

R. Wolf, in his Astronomische Mittheilungen, No. 45 (Vierteljahrsschrift der naturforschenden Gesellschaft in Zurich, 1878), has given a resume of the manuscripts still preserved at Kassel, which throw much light on the methods adopted in the observations and reductions.

Family and children

William was married to Sabine of Württemberg, daughter of Christoph, Duke of Württemberg.
They had the following children:

1. Anna Maria of Hesse-Kassel (27 January 1567 – 21 November 1626), married on 8 June 1589 to Louis II, Count of Nassau-Weilburg
2. Hedwig of Hesse-Kassel (30 June 1569 – 7 July 1644), married on 11 September 1597 to Ernst of Schaumburg
3. Agnes of Hesse-Kassel (30 June 1569 – 5 September 1569)
4. Sofie of Hesse-Kassel (10 June 1571 – 18 January 1616)
5. Maurice, Landgrave of Hesse-Kassel (25 May 1572 – 15 March 1632), succeeded as landgrave on William IV's death in 1592.
6. Sabine of Hesse-Kassel (12 May 1573 – 29 November 1573)
7. Sidonie of Hesse-Kassel (29 June 1574 – 4 April 1575)
8. Christian of Hesse-Kassel (14 October 1575 – 9 November 1578)
9. Elisabeth of Hesse-Kassel (11 May 1577 – 25 November 1578)
10. Christine (19 October 1578 – 19 August 1658), married on 14 May 1598 to John Ernst, Duke of Saxe-Eisenach
11. Juliane, born and died 9 February 1581

In addition William had a few illegitimate children. Most significant and favored among these was Philipp von Cornberg (1553–1616), William's son by Elisabeth Wallenstein. Philipp was ennobled by his father and became the ancestor of the current Barons von Cornberg.

Ancestors

Ancestors of William IV, Landgrave of Hesse-Kassel

16. Louis I, Landgrave of Hesse 8. Louis II, Landgrave of Hesse 17. Anna of Saxony 4. William II, Landgrave of Hesse 18. Ludwig I, Count of Württemberg-Urach 9. Matilda of Württemberg-Urach 19. Mechthild of the Palatinate 2. Philip I, Landgrave of Hesse 20. Henry IV, Duke of Mecklenburg 10. Magnus II, Duke of Mecklenburg-Schwerin and Güstrow 21. Dorothea of Brandenburg 5. Anna of Mecklenburg-Schwerin 22. Eric II, Duke of Pomerania 11. Sophie of Pomerania-Wolgast 23. Sophia of Pomerania-Stolp 1. William IV, Landgrave of Hesse-Kassel 24. Frederick II, Elector of Saxony 12. Albert III, Duke of Saxony 25. Margarete of Austria 6. George, Duke of Saxony 26. George of Poděbrady 13. Sidonie of Poděbrady 27. Kunigunde of Sternberg 3. Christine of Saxony 28. Władysław II Jagiełło 14. Casimir IV Jagiellon 29. Sophia of Halshany 7. Barbara Jagiellon 30. Albert II of Germany 15. Elisabeth of Austria 31. Elizabeth of Luxembourg

References

• This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "William IV. of Hesse". Encyclopædia Britannica. Vol. 28 (11th ed.). Cambridge University Press.

External links

• Biographical data and references at The Galileo Project