Britannica Sources used in this answer

Hugo Grotius - Involvement in politics

Where did Hugo Grotius go after escaping from Loevestein Castle?

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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.

After escaping from Loevestein Castle in 1621 by hiding in a chest of books, Hugo Grotius fled to Antwerp and eventually settled in Paris. He remained in Paris until 1631 under the patronage of King Louis XIII.1