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In the 17th century , the castle became a royal prison , and a state prison after the French Revolution , continuing in this role until the start of the 20th century when it became the Pyrenean Museum ( Musée Pyrénéen ) ( 1921 ) which it remains Description The castle 's origins go back to Roman times .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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