Princess Luise Dorothea of Prussia  Princess Luise Dorothea of Prussia (Luise Dorothea Sophie; 29 September 1680 – 23 December 1705) was Hereditary Princess of Hesse-Kassel by marriage to Frederick, Hereditary Prince of Hesse-Kassel. She was the daughter of Frederick I, First King in Prussia by his first wife Elisabeth Henriette of Hesse-Kassel. She died in childbirth. On 31 May 1700, she married her first cousin Frederick, Hereditary Prince of Hesse-Kassel. Frederick was King of Sweden 1720-1751 and Landgrave of Hesse-Kassel from 1730-1751. Luise Dorothea was married in Berlin 31 May 1700 in a grand ceremony which took place during several weeks to great costs. Conrad Mel wrote "Font Legatio orientalis" at the occasion. During her five years of marriage, Luise Dorothea suffered from poor health. She died in childbirth. Frederick remarried to Queen Ulrika Eleonora of Sweden, becoming her prince consort and eventual King regnant of Sweden.