Großherzog von Hessen und bei Rhein; 12 September 1837 – 13 March 1892) was the Grand Duke of Hesse and by Rhine from 13 June 1877 until his death in 1892.

[2] Princess Alice's interest in social services, scientific development, hands-on child-rearing, charity and intellectual stimulation were not shared by Louis who, although dutiful and benevolent, was bluff in manner and conventional in his pursuits.

[2] The death of the younger of their two sons, Frittie, who was afflicted with hemophilia and suffered a fatal fall from a palace window before his third birthday in 1873, combined with the wearying war relief duties Alice had undertaken in 1870, evoked a crisis of spiritual faith for the princess in which her husband does not appear to have shared.

Hesse-Darmstadt appears to have been spared this fate only by a cession of territory and the close dynastic kinship between its ruler and the Emperor of Russia (Alexander II's consort, Empress Maria Alexandrovna, was the sister of Hesse's Grand Duke Louis III and of Prince Charles).

He was credited with courageous military service, especially at the Battle of Gravelotte,[2] which also afforded him the opportunity of mending the previous war's grievances with the House of Hohenzollern by fighting on the same side as his brother-in-law and future emperor, Crown Prince Frederick William of Prussia.

Grand Duchess Alice having died in 1878, Louis IV contracted a morganatic marriage on 30 April 1884 in Darmstadt (on the eve of the wedding of his eldest daughter, for which Queen Victoria and other relatives of his first wife were gathered in the Hessian capital) with Countess Alexandrine von Hutten-Czapska (3 September 1854 – 8 May 1941), younger daughter of Count Adam von Hutten-Czapski (1819–1884) and his wife, Countess Marianna Rzewuska (1827–1897).