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He even went so far as to build a Lustschloss , the Julianenburg in Sandhorst , for his wife Landgravine Juliana , in the middle of the war , while the population of East Frisia was suffering bitterly .
 Juliana, Frisia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Juliana, Frisia