Duke William was born at Carlsruhe, Kingdom of Prussia (now Pokój, Poland) was the first child of Duke Eugen of Württemberg (1788–1857), (son of Duke Eugen of Württemberg, and Princess Louise of Stolberg-Gedern) by his second marriage to Princess Helene of Hohenlohe-Langenburg (1807–1880), (daughter of Charles Louis, Prince of Hohenlohe-Langenburg and Countess Amalie of Solms-Baruth).
In 1879 he enlisted in the Austrian Army (in 19th century southern Poland was occupied by Austria and named Galicia), where he gained popularity by making portraits of his fellow soldiers and commanding officers, including a portrait of General Duke William of Württemberg and portrait of Lieutenant Field Marshal Emanuel Salomon of Friedberg - Mírohorsky (this army officer also was a genre painter, it is possible, why later in USA Karl Witkowski became genre painter).
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