Philip I, Landgrave of Hesse, died in 1567. Hesse was then divided between his four sons, thus four main branches arose: Hesse-Kassel, Hesse-Marburg, Hesse-Rheinfels and Hesse-Darmstadt.
The Battenberg family are morganatic descendants in the male-line of the House of Hesse, issuing from the marriage of Prince Alexander of Hesse and by Rhine with Countess Julia Hauke who, along with her children and agnatic descendants, were made princes and princesses of Battenberg and Serene Highnesses.[1] The Battenbergs who later settled in England changed that name to Mountbatten after World War I at the behest of George V, who substituted British peerages for their former German princely title.[1] Those descended from the marriage of Alexander of Battenberg, Prince of Bulgaria, contracted with a commoner after the loss of his throne, were granted the title Count von Hartenau.[1]
Hesse-Kassel and its junior lines were annexed by Prussia in 1866. Hesse-Darmstadt became the People's State of Hesse when the monarchy was abolished in 1918. Hesse-Philippsthal died out in the male line in 1925, and Hesse-Darmstadt in 1968. The male-line heirs of Hesse-Kassel and Hesse-Philippsthal-Barchfeld continue to exist to the present day.[1]