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Which languages did William I learn while growing up in the Low Countries?

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Portrait of William I, Prince of Orange, by Adriaen Thomasz Key. He wears a dark embroidered coat, a white ruff collar, and a black cap, with a trimmed beard and mustache. — William I Portrait of William I, oil on panel by Adriaen Thomaszoon Key, c. 1579; in the Rijksmuseum, Amsterdam.

While growing up in the Low Countries under the guidance of tutors, William I (William the Silent) adopted French as his daily language. Additionally, he acquired a colloquial command of Dutch.1