56322
He spent the provincial command year summer 57 to summer 56 BC in Bithynia on the staff of the commander Gaius Memmius .
 Bithynia, Gaius Memmius
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:
 Bithynia, Gaius Memmius