István Antal Mária Illés Count von Wenckheim was born 20 July 1858 in Bad Ischl, Gmunden District, Upper Austria, Austria to Antal de Padua von Wenckheim (1813-1864) and Maximiliana Zichy de Zich et Vásonkeõ (1822-1881) and died 26 February 1923 Veľké Leváre, Malacky District, Bratislava Region, Slovakia of unspecified causes. He married Huberta Kollonitz de Kollegrád (1862-1884) 17 September 1881 in Veľké Leváre, Malacky District, Bratislava Region, Slovakia. He married Mária Margit Pálffy de Erdõd (1863-1954) 22 August 1887 in Malacky, Malacky District, Bratislava Region, Slovakia.
Children
| Name | Birth | Death | Joined with |
| Erzsébet Teréz von Wenckheim (1888-1964) | |||
| Miklós von Wenckheim (1890-1967) | |||
| Antal von Wenckheim (1891-1976) | 15 March 1891 Veľké Leváre, Malacky District, Bratislava Region, Slovakia | 25 February 1976 Lausanne, Lausanne District, Vaud, Switzerland | Livia Zichy de Zich et Vásonkeõ (1895-1971) |
| Margit von Wenckheim (1892-1964) | |||
| Frigyes von Wenckheim (1895-1953) | |||
| Mária von Wenckheim (1898-1977) | |||
Residences
Footnotes (including sources)