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How did Hugo Grotius escape from Loevestein Castle in 1621?

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Oil portrait of Hugo de Groot, also known as Hugo Grotius, by the workshop of Michiel Janszoon van Mierevelt, showing him with a ruffled white collar and dark clothing. — Hugo Grotius Portrait of Hugo de Groot (Hugo Grotius), oil on panel by the workshop of Michiel Janszoon van Mierevelt, 1631; in the Rijksmuseum, Amsterdam.

In 1621, Hugo Grotius successfully escaped his life imprisonment at Loevestein Castle with the assistance of his wife, Maria van Reigersberch. He managed to leave the fortress by hiding inside a chest used for transporting books. Following his escape, he fled to Antwerp and eventually settled in Paris.12