1938
The silver content of the denarius under the Roman Empire ( after Nero ) was about 50 grains , 3.24 grams , or ( 0.105 ozt ) troy ounce .
 location: Roman Empire; person: Nero
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Roman Empire; person: Nero