39819
In the early 19th century there was much interest in enclosing and " improving " the open moorland on Dartmoor , encouraged by Sir Thomas Tyrwhitt 's early successes at Tor Royal near Princetown .
 Dartmoor, Thomas Tyrwhitt, Tor Royal, Princetown
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dartmoor, Thomas Tyrwhitt, Tor Royal, Princetown