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In relation to slavery and Roman law In ancient Rome emancipation was a process of law by which a slave released from the control of his master , or a son liberated from the authority of his father ( patria potestas ) , was declared legally independent .
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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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