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It is recorded in a document dated April 12 , 970 , being part of the Archives of the Roman Catholic Archdiocese of Pisa and probably also in another document dating back to June , in the year 857 .
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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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