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Orvieto , Umbria , Italy , was the refuge of five popes during the 13th century : Urban IV ( 1261 – 1264 ) , Gregory X ( 1271 – 1276 ) , Martin IV ( 1281 – 1285 ) , Nicholas IV ( 1288 – 1292 ) and Boniface VIII ( 1294 – 1303 ) .
 Orvieto, Umbria, Italy, Urban IV, Gregory X, Martin IV, Nicholas IV, Boniface VIII
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Orvieto, Umbria, Italy, Urban IV, Gregory X, Martin IV, Nicholas IV, Boniface VIII