Duke Christian Ulrich I of Württemberg-Oels (9 April 1652, at Oels Castle in Oels – 5 April 1704, in Oels Castle) was a German nobleman. He was the ruling Duke of Württemberg-Bernstadt from 1669 to 1697 and then the ruling Duke of Oels-Württemberg from 1697 until his death. Descent Christian Ulrich I was the third son of Duke Silvius I Nimrod of Württemberg-Oels from his marriage with Duchess Elisabeth Marie, a daughter of Duke Charles Frederick I Poděbrady, Duke of Oels and Anne Sophie of Saxe-Weimar. Reign When his oldest brother Charles Ferdinand died in 1669, Christian Ulrich inherited the Duchy of Bernstadt. When his older brother Silvius II Frederick died in 1697, Christian Ulrich inherited the Duchy of Oels, Christian Ulrich kept the Duchies of Oels and Dobroszyce with Międzybórz and parts of Trebnitz and transferred Bernstadt to his nephew Charles. In 1698, Christian Ulrich built a ducal crypt as an extension of Castle Church of St. John. He began a significant collection of books and art at Oels Castle. In 1685, he purchased the town of Neudorf from Balthasar Wilhelm von Prittwitz, Lord of Rastelwitz. Between 1685 and 1692, he constructed a baroque castle at Neudorf, which he named Sibyllenort, after his second wife, Marie Sibylle of Saxe-Merseburg. He died on 5 April 1704, aged 51, at Oels Castle and was buried in the ducal crypt he had built. Marriage and Issue He completed his first marriage, on 13 March 1672 in Bernburg with Anna Elisabeth of Anhalt-Bernburg, daughter of Prince Christian II of Anhalt-Bernburg and Eleonora Sophia of Schleswig-Holstein Sonderburg. With her he had seven children: Louise Elisabeth (born: 22 February 1673 in Bernstadt; died: 28 April 1736 in Forst), Princess of Württemberg-Oels, married Duke Philip of Saxe-Merseburg-Lauchstädt. Christian Ulrich (born: 21 February 1674 in Bernstadt; died: 2 July 1674 in Bernstadt), Hereditary Prince of Württemberg-Oels. Leopold Viktor (born: 22 May 1675 in Bernstadt; died: 30 April 1676 in Bernstadt), Hereditary Prince of Württemberg-Oels. Fredericka Christine (born: 13 May 1676 in Bernstadt; died: 3 June 1676 in Bernstadt), Princess of Württemberg-Oels. Sophie Angelika (born: 30 May 1677 in Bernstadt; died: 11 November 1700 in Pegau), Princess of Württemberg-Oels, married Duke Frederick Henry of Saxe-Zeitz-Pegau-Neustadt. Eleonore Amöena (born: 21 October 1678 in Breslau; died: 2 April 1679 in Bernstadt), Princess of Württemberg-Oels. Theodosia (born: 20 July 1680 in Bernstadt; died: 21 September 1680 in Bernstadt), Princess of Württemberg-Oels.