Background
Charles was the eldest son of Landgrave Philip of Hesse-Philippsthal from his marriage to Catherine Amalie (1654–1736), daughter of Count Charles Otto of Solms-Laubach.
Charles was the eldest son of Landgrave Philip of Hesse-Philippsthal from his marriage to Catherine Amalie (1654–1736), daughter of Count Charles Otto of Solms-Laubach.
He succeeded his father in 1721 as Charles I, Landgrave of Hesse-Philippsthal. Charles joined the Danish army in 1701 and fought in the War of the Spanish Succession. On 10 March 1710, he distinguished himself at the Battle of Helsingborg and was promoted to Major General.
In 1715 he was involved in the landing at Rügeneral and the subsequent siege of Stralsund.
He then joined the French arny and was appointed Lieutenant General on 13 March 1721. Charles married on 24 November 1725 in Eisenach Caroline Christine (1699–1743), daughter of Duke John William III of Saxe-Eisenach, with whom he had the following children:.