86160
It has existed as a recognized group of principles and techniques since at least as early as the middle of the first millennium BCE , and was usually associated with training in rhetoric or logic , but variants of the art were employed in other contexts , particularly the religious and the magical .
 first millennium BCE
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:
 first millennium BCE