Josias Rantzau (Bothkamp, near Kiel, 18 October 1609[1] – Paris, 14 September 1650[2]) was a Danish military leader andMarshal of France.
Josias was the grandson of Paul, the youngest son ofJohann Rantzau. He married his Cousin Hedwig Margarethe Elisabeth vor Rantzau, but had no children.[3]
As a young man, he servedPrince Maurice of Orange and KingChristian IV of Denmark.[4] Later he fought for Sweden, then the Holy Roman Empire, again for Sweden[5] and finally since 1635 for France, where he was noticed at Court for his blond beauty.
He commanded troops in theFranche-Comté,[6] on the Rhine,[6] and in Flanders. In 1633, he successfully defendedAndernach against the Spanish,[7] but is in general better remembered for his bravery than for his military skills.