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A charter issued by King Coenwulf of Mercia refers to a council which had taken place close to what is called the monasterium ( meaning minster ) of Croydon .
 Coenwulf of Mercia, Croydon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Coenwulf of Mercia, Croydon