Count Karl was born into an old noble family in which several members pursued military careers, including his brothers Lajos, Viktor, and György, with the Imperial army. His father, Friedrich, Count zu Leiningen-Westerburg, inherited the county of Altleiningen, but had divorced his first wife, Charlotte von Zech und Rautenburg, in 1798 after six years of childless marriage. By the time Count Friedrich remarried Eleonore Breitwieser in 1813 he already had several children by her, legitimised by their parents' marriage. Karl, being born after the wedding, was legitimate from birth. Count Károly married rich Hungarian noblewoman :File:Törökbecsei_Sissányi_Erzsébet.jpg|Erzsébet Sissányi de Törökbecse in 1844, thereby becoming proprietor of the Hungarian estate of Törökbecse. In the autumn of 1848, the Temesvár regiment was mobilized, and Károly volunteered for the campaign waged against the Serbs. By December 1848 he had become a major, was promoted to lieutenant colonel in March 1849, and to colonel in April. He acquired more renown during the spring campaign and was promoted to the rank of general on July 1. Discharged on July 2, along with Louis Benedict Szőny, he joined the Hungarian uprising. . Before the final defeat, he successfully repulsed a number of attacks. He was captured and sentenced to death by hanging. His last recorded words were: "I have only just learned the tidings blared by the newspapers...I have no documents with which to refute any incident, but I have faith that at the last God's skies will open before all -- and when I come before the throne of God's eternal judgment -- these allegations of me shall be solemnly denounced as low slander." His death by hanging was carried out along with the rest of the partisans.
Family
His wife bore him two children:
Elizabeth "Liza" Victoria Constance Frederica Eleanor, who became the wife of the British generalWilliam Barwell, and from whom Lilien, Henriette and her child Richard were born.
Armin , who served in the Royal Hungarian army, but due to health issues retired at the rank of captain. After that, he took a position in Titel, Ministerial Commissioner for the Tisza-Danube Belvizszabályozó Society. He published his father's diary and correspondence. His body was moved to its final resting place in 1903 in Titel.
Károly's widow remarried in 1854 and with her second husband, Count József Bethlen de Bethlen, bore four more children. In 1911 a statue to Károly's heroism and martyrdom was erected in Törökbecse.
