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Duke Paul Frederick of Mecklenburg ( ; 19 September 1852 – 17 May 1923 ) was a member of the House of Mecklenburg-Schwerin and general of the Mecklenburg cavalry .
 Duke, Frederick, Mecklenburg, Mecklenburg-Schwerin, Mecklenburg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Duke, Frederick, Mecklenburg, Mecklenburg-Schwerin, Mecklenburg