found: Harcourt, P. Madame la duchesse d'Orléans (Hélène de Mecklembourg-Schwerin), 1859.
found: Grande ency.(Orléans, Hélène-Louise-Elisabeth de Mecklembourg-Schwerin, duchesse d'; b. Ludwiglust, 24 Jan. 1824 [i.e. 1814]; m. 30 May 1837, duc d'Orléans, eldest son of Louis-Philippe; d. 18 May 1858)
found: Michaud(Orléans, Hélène-Louise-Elisabeth de Mecklembourg-Schwerin, duchesse d'; b. 24 Jan. 1814)
found: OCLC, 4 Mar. 1997(hdg.: Orléans, Hélène Louise Elisabeth de Mecklembourg-Schwerin, duchesse d', 1814-1858; Orléans, Hélène Louise Elisabeth, duchesse d', 1814-1858)
found: Wikipedia, December 14, 2016(Duchess Helene of Mecklenburg-Schwerin; Helene of Mecklenburg-Schwerin (Helene Luise Elisabeth; 24 January 1814-17 May 1858) was a French Crown Princess after her marriage in 1837 to the eldest son of Louis Philippe I, Ferdinand Philippe of Orléans; born at the Schloss Ludwigslust, she was the only daughter born to the Hereditary Grand Duke of Mecklenburg-Schwerin (1778-1819) and his second wife Princess Karoline Luise of Saxe-Weimar-Eisenach (1786-1816); on 30 May 1837 Helene Luise married Ferdinand Philippe d'Orléans; she became popular with the public by her introduction of the German Christmas tree in France; the couple had two children: Philippe, born at the Palais des Tuileries in Paris, would later be hailed as Louis Philippe II by Royalists; their other son, Robert, fought for the Union in the American Civil War, and then for France in the 1870 Franco-Prussian War; on 13 July 1842, her husband died from injuries sustained after jumping from an out of control carriage; in 1848, her father-in-law was deposed; Helene appeared at the French parliament with her two sons to claim her son's right to the throne and to be installed as his regent during his minority, but this claim was not accepted by the parliament; after failing to seize power, she left France for Germany with her children; Helene continued to actively claim the rights of her son to be the monarch of France from abroad; Helene died of a flu in Richmond; she was initially buried at Weybridge before being moved to the Chapelle royale de Dreux in Dreux in 1876)
found: Find A Grave, via WWW, December 14, 2016(Helene Louise von Mecklenburg-Schwerin; born January 24, 1814 in Ludwigslust-Parchimer Landkreis, Mecklenburg-Vorpommern, Germany; died May 18, 1858 in Richmond, Greater London, England; Duchess d'Orléans; born Helene Luise Elisabeth Herzogin von Mecklenburg-Schwerin at Ludwigslust, Mecklenburg-Vorpommern, Germany, the daughter of Friedrich Ludwig Erbgrossherzog von Mecklenburg-Schwerin and Karoline Luise, Prinzessin von Sachsen-Weimar-Eisenach; she married Ferdinand Philippe d'Orléans, Prince héréditaire de France, Duc d'Orléans in May 1837; a happy marriage, it produced two sons; within five years, however, her husband was killed in a carriage accident in Sablonville; in February 1848, after the abdication of Louis Philippe, the duchess applied to the Chamber of Deputies in the hope of having her eldest son proclaimed heir and of obtaining the regency, but the hostility of the populace forced her to flee; she took refuge in England, where she died ten years later at the age of 44; she was returned to France for burial)
notfound: Ency. Brit. 11th ed.