Marie Eleonore of Cleves

Duchess Marie Eleonore
Duchess consort of Prussia
Tenure	14 October 1573 - 1 June 1608
Born	(1550-06-16)16 June 1550 Cleves
Died	1 June 1608(1608-06-01) (aged 57) Königsberg
Spouse	Albert Frederick, Duke of Prussia ​ ​ (m. 1573)​
Issue	Anna, Duchess of Prussia, Electress of Brandenburg Marie, Margravine of Brandenburg-Bayreuth Albert Frederick of Prussia Sophie, Duchess of Courland and Semigallia Eleonore, Electress of Brandenburg Wilhelm Frederick of Prussia Magdalene Sibylle, Electress of Saxony
House	La Marck
Father	William, Duke of Jülich-Cleves-Berg
Mother	Archduchess Maria of Austria

Duchess Marie Eleonore of Cleves (16 June 1550 – 1 June 1608) was the Duchess of Prussia by marriage to Albert Frederick, Duke of Prussia. She was the eldest child of William, Duke of Jülich-Cleves-Berg and Maria of Austria.

She was the maternal granddaughter of Ferdinand I, Holy Roman Emperor and Anna of Bohemia and Hungary, and sister of John William, Duke of Jülich-Cleves-Berg.

While her father was a Roman Catholic, Marie Eleonore displayed firm Lutheran sympathies early on. Her father was afraid that she would influence her younger sisters with her religious views, and therefore wished to have her married to someone of her own religious convictions as soon as possible in order to remove her from his domains, and thus considered grooms for his daughter that he would not otherwise have considered.^[1] Albert Frederick, Duke of Prussia, the son of Albert of Prussia, was thus accepted as a suitor, despite showing mental disorders.^[2] The wedding was conducted in 1573, and Marie Eleonore departed to Lutheran Prussia.

In 1577, her mentally ill spouse was placed under the regency of his cousin George Frederick, Margrave of Brandenburg-Ansbach, which made the position of Marie Eleonore more difficult at the Ducal court of Königsberg.^[3] In 1591, she returned with her daughters to Jülich, where she remained until 1592. She arranged the marriage of her daughters to German princes to avoid them being married by the Regency Council to Polish suitors, and by the marriage alliances she arranged, she ensured that the Duchy of Jülich would pass to Brandenburg after the death of her brother.^[4]

• Anna of Prussia (3 July 1576 – 30 August 1625); married John Sigismund, Elector of Brandenburg.
• Duchess Marie of Prussia (23 January 1579 – 21 February 1649); married Christian, Margrave of Brandenburg-Bayreuth.
• Duke Albert Frederick of Prussia (1 June 1580 – 8 October 1580).
• Duchess Sofie of Prussia (31 March 1582 – 4 December 1610); married Wilhelm Kettler of Courland.
• Duchess Eleonore of Prussia (22 August 1583 – 31 March/9 April 1607); married Joachim Frederick, Elector of Brandenburg.
• Duke Wilhelm Frederick of Prussia (23 June 1585 – 18 January 1586).
• Duchess Magdalene Sibylle of Prussia (31 December 1586 – 22 February 1659); married John George I, Elector of Saxony.