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The MacMahon family originated in Ireland and established itself in France, where it gained prominence. John MacMahon, an Irish doctor born in Limerick, was naturalised in France in 1749 and married Charlotte Le Belin, Dame d'Eguilly, on 13 April 1750. That same year, he was created Marquis d'Eguilly by King Louis XV of France. His son, the second Marquis, served in the American War of Independence and was a founding member of the Society of the Cincinnati.
A grandson of the first Marquis, Patrice de MacMahon, served with distinction as a general in the Crimean War and later in the Austro-Sardinian War, winning the Battle of Magenta on 4 June 1859. The following day, he was created Duc de Magenta by Emperor Napoleon III. During the 1870s, he became the President of the French Republic.
Marquises of Eguilly (1750)
- Jean Baptiste MacMahon, 1st Marquis de MacMahon (1715-1775)
- Charles Laure MacMahon, 2nd Marquis de MacMahon (1752-1830)
- Charles Marie MacMahon, 3rd Marquis de MacMahon (1793-1845)
- Charles Henri MacMahon, 4th Marquis de MacMahon (1828-1863)
- Charles Marie MacMahon, 5th Marquis de MacMahon (1856-1894)
- Marie Armand Patrice MacMahon, 6th Marquis de MacMahon (1855-1927); he had previously succeeded as 2nd Duc de Magenta (see below)
Dukes of Magenta (1859)
- Marie Edme Patrice Maurice de MacMahon, 1st Duc de Magenta (1808-1893)
- Patrice de MacMahon, 2nd Duc de Magenta, 6th Marquis de MacMahon (1855-1927)
- Maurice de MacMahon, 3rd Duc de Magenta, 7th Marquis de MacMahon (1903-1954)
- Philippe de MacMahon, 4th Duc de Magenta, 8th Marquis de MacMahon (1938-2002)
- Maurice de MacMahon, 5th Duc de Magenta, 9th Marquis de MacMahon (born 1992)
- Paul Theroff. "Magenta". Angelfire.com. Retrieved 2016-02-28.
- https://web.archive.org/web/20001109135700/http://geneweb.inria.fr/roglo. Archived from the original on November 9, 2000. Retrieved April 13, 2006. Missing or empty