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He was a midshipman in the Royal Navy from 1836 to 1845 , then joined his father not only ran his own farm but was also agent for the Duke of Devonshire at Lismore Castle , Ireland .
 Royal Navy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Royal Navy