294666
Van Brosterhuysen made a number of important friends , including people such as the humanist and theologian Caspar Barlaeus and poet P. C. Hooft , and especially Huygens , a poet and composer and secretary to princes of the House of Orange : In 1634 , he was able to cure ( perhaps with a botanical remedy ) Huygens 's wife of kidney stones , and a Latin poem by Huygens dated 1627 thanks Brosterhuysen for advising him on horticultural matters .
 Caspar Barlaeus, P. C. Hooft, Huygens, Huygens, Huygens
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Caspar Barlaeus, P. C. Hooft, Huygens, Huygens, Huygens