On 1 May 1868, Prince Friedrich Karl Ludwig Konstantin of Hesse was born at the family manor of Gut Panker in Holstein. Friedrich Karl was the third son and fourth child of Landgrave Friedrich Wilhelm of Hesse (1820-1884) and his second wife Princess Anna of Prussia (1836-1918).
|Prince Friedrich Karl of Hesse and Princess Margarete of Prussia in 1893|
|The six sons of Friedrich Karl of Hesse and Margarete of Prussia|
|King Frederik Kaarle I of Finland|
|Philipp of Hesse and Mafalda of Savoy on their wedding day in 1925|
|A prototype of the crown planned for King Frederik Kaarle I of Finland|