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In page Wilhelm I:

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In 1829, Wilhelm married Princess Augusta of Saxe-Weimar-Eisenach, the daughter of Grand Duke Karl Friedrich of Saxe-Weimar-Eisenach and Maria Pavlovna, the sister of Nicholas I. Their marriage was outwardly stable, but not a very happy one.[4] In 1834-37 he had the Old Palace in Berlin built as a new family home, in which he continued to live later as king and emperor, while he only used the Berlin Palace for representative purposes.[citation needed]