47705
One of these people 's ancient cities is now the archeological site of Chiapa de Corzo , in which was found the oldest calendar known on a piece of ceramic with a date of 36 BCE .
 Chiapa de Corzo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Chiapa de Corzo