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Hero Oomkens von Esens ( c. 1455 – 1522 ) was a Frisian nobleman , Earl of Harlingerland , who inherited the title on the death of his father , Sibet Attena von Esens , in 1473 .
 Hero Oomkens von Esens, Sibet Attena von Esens
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hero Oomkens von Esens, Sibet Attena von Esens