67508
From the reign of Emperor Trần Thái Tông onward , 1 " tiền " was 69 " đồng " in ordinary commercial transactions but 1 " tiền " was 70 " đồng " for official transactions .
 Trần Thái Tông
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:
 Trần Thái Tông