| Prince Ludwig August | |
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| Full Name: | Ludwig August Maria Eudes |
| House: | Saxe-Coburg and Gotha-Koháry |
| Father: | Prince August of Saxe-Coburg and Gotha |
| Mother: | Clémentine of Orléans |
| Birth Name: | Prinz Ludwig August von Sachsen-Coburg und Gotha |
| Birth Date: | 8 August 1845 |
| Birth Place: | Château d'Eu, Eu, France |
| Death Place: | Karlsbad, Bohemia, Austria-Hungary |
| Burial Place: | St. Augustin, Coburg, Germany |
Prince Ludwig August of Saxe-Coburg and Gotha (Ludwig August Maria Eudes; 8 August 1845 – 14 September 1907), known in Brazil as Dom Luís Augusto, was a German prince of the House of Saxe-Coburg and Gotha-Koháry and an Admiral in the Imperial Brazilian Navy.
He was born at the Château d'Eu in France, the second son of Prince August of Saxe-Coburg and Gotha and Princess Clémentine of Orléans. His father was a first cousin of Victoria of the United Kingdom and her consort, Prince Albert of Saxe-Coburg and Gotha. Through his mother he was a grandson of Louis-Philippe I, the last reigning king of France.
Ludwig August and his double first cousin, the French Prince Gaston, comte d'Eu (son of Victoire, sister of August's father; and prince Louis, the brother of August’s mother) were imported to Brazil in order to marry the two daughters of the Emperor Pedro II of Brazil: Isabel, the elder, and Leopoldina, the younger. The original plan was for August to marry Isabel and Gaston to Leopoldina, but the girls decided otherwise and the Emperor, having himself experienced the unhappinesses of an arranged dynastic marriage, agreed to their wishes.
Ludwig August and Leopoldina married in Rio de Janeiro on 15 December 1864, two months after the wedding of Isabel and Gaston. They had four sons:
His wife died young, aged 23, in 1871. He died on 14 September 1907 in Karlsbad, Bohemia, aged 62.