August von Senarclens de Grancy

August Ludwig Freiherr von Senarclens-Grancy (; 19 August 17943 October 1871) was the firstborn son of three sons and four daughters of César Auguste, Baron von Senarclens de Grancy, (born in 1763) and his wife Élizabeth Claudine Marie-Rose de Loriol (born in 1773). He is reputed to have been the long-time lover of Wilhelmine of Baden, the Grand Duchess consort of Hesse, and the actual father by her of the Empress consort Maria Alexandrovna of Russia and Prince Alexander of Hesse, ancestors of modern royalty in Bulgaria, Germany, Romania, Serbia, Spain, Sweden, United Kingdom and Russia.