165089
The opera 's libretto , by Alphonse du Congé Dubreuil , is based on a play of the same name by Claude Guimond de la Touche , although the ultimate source was the tragedy Iphigeneia in Tauris by Euripides .
 Euripides
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Euripides