Erwein, 4th Count of Schönborn-Buchheim

His father became the titular Count of Schönborn-Buchheim in 1844 when his brother, Erwein, resigned his rights in his favor.^[5] Ten years later, his father died and eleven year-old Erwein became the 4th Count of Schönborn-Buchheim.^[6]

On 11 April 1864 in Vienna, the Count married Countess Franziska von Trauttmansdorff-Weinsberg (1844–1898), a daughter of Prince Ferdinand Joachim von Trauttmansdorff-Weinsberg (a grandson of Prince Ferdinand von Trauttmansdorff) and Princess Anna of Liechtenstein (a daughter of Prince Karl of Liechtenstein, himself a grandson of Prince Karl Borromäus of Liechtenstein). Together, they were the parents of:^[2]

• Anna Marie von Schönborn-Buchheim (1865–1954), who married Prince Gottfried Karl Joseph of Hohenlohe-Langenburg, a son of Prince Ludwig Karl Gustav of Hohenlohe-Langenburg and Countess Maria Gabriele von Trauttmansdorff, in 1890.^[7]
• Franziska von Schönborn-Buchheim (1866–1937), who married Prince Konrad of Hohenlohe-Schillingsfürst, son of Prince Konstantin of Hohenlohe-Waldenburg-Schillingsfürst and Princess Marie of Sayn-Wittgenstein-Berleburg, in 1888.^[8]
• Irma Caroline Gabrielle von Schönborn-Buchheim (1867–1946), who married Maximilian Egon II, Prince of Fürstenberg, the son of Prince Maximilian Egon I of Fürstenberg (a younger son of Charles Egon III, Prince of Fürstenberg) and Countess Leontina von Khevenhüller-Metsch, in 1889.^[9][10]
• Friedrich Karl von Schönborn-Buchheim (1869–1932), who married Donna Teresa Dentice di Frasso, a daughter of Count Don Ernesto, 7th Prince Dentice di Frasso, and Countess Luisa Chotek von Chotkowa und Wognin, in 1901.^[11] After her death in 1909, he married his late wife's niece, Donna Sofia Dentice di Frasso, a daughter of Don Luigi, 8th Prince Dentice di Frasso and Countess Emilia von Thurn und Valsássina-Como-Vercelli, in 1910. They divorced in 1922.^[12]
• Erwein Ferdinand Karl Rochus von Schönborn-Buchheim (1871–1937), who married American socialite Katherine "Kitty" (née Wolff) Spotswood, the daughter of Dr. Lawrence Wolff and former wife of Dandridge Spotswood, in 1911.^[13][14] They divorced in 1924 and she married banker Baron Eugène von Rothschild.^[15][16][17]

The Count died on 20 January 1903 at Göllersdorf, Lower Austria, and was succeeded by his eldest son, Friedrich Karl.^[18]

Through his son Friedrich Karl, he was a grandfather of Countess Franziska of Schönborn-Buchheim (1902–1987), who married Prince Alfred of Lippe-Weissenfeld (parents of Princess Teresa of Lippe-Weissenfeld, who married industrialist Baron Hans Heinrich Thyssen-Bornemisza and Prince Friedrich Maximilian zu Fürstenberg); and Georg von Schönborn-Buchheim (1906–1989), himself the father of Friedrich Karl von Schönborn-Buchheim who married Princess Isabelle d'Orleans of France (eldest daughter of Henri, Count of Paris) in 1964.^[19]

Through his daughter Franziska, he was a grandfather of Prince Alfred of Hohenlohe-Schillingsfürst, and Princess Franziska of Hohenlohe-Waldenburg-Schillingsfürst (1897–1989), who married Archduke Maximilian of Austria, thereby becoming sister-in-law of Archduke Karl Franz of Austria, the last Emperor of Austria.^[20]