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St Vigeans , close to Arbroath , was the centre of a royal estate in the Early Middle Ages , and was of religious importance as a monastery founded in the 8th century .
 Vigeans, Arbroath
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vigeans, Arbroath