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Traditionally , Copenhagen 's founding has been dated to Bishop Absalon 's construction of a modest fortress on the little island of Slotsholmen in 1167 where Christiansborg Palace stands today .
 Copenhagen, Absalon, Slotsholmen, Christiansborg Palace
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Copenhagen, Absalon, Slotsholmen, Christiansborg Palace