15th December 1667
12th September 1739
Ernest Louis of Hesse-Darmstadt was Landgrave of Hesse-Darmstadt from 1678 to 1739. His parents were Landgrave Louis VI of Hesse-Darmstadt and Elisabeth Dorothea of Saxe-Gotha-Altenburg (1640–1709).
Ernest Louis's desire to emulate the French court under Louis XIV ran his country into debt. Among those patronized in this cultural flourish was Baroque composer Christoph Graupner; also bringing into his service architect Louis Remy de la Fosse for his extensive building program. Upon his death in 1739, his country's debt was 4 million gulden, ten times the annual revenue.