21993
Olympias ' influence instilled a sense of destiny in him , and Plutarch tells how his ambition " kept his spirit serious and lofty in advance of his years " .
 Olympias, Plutarch
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Olympias, Plutarch