The voyages of Zheng he, development of blue and white porcelain, and the establishment of the forbidden city are all associated with the: Ming Dynasty
Zheng he held the position as the fleet admiral during the Ming Dynasty and became the first Chinese mariner that opened up the map from China to South East Asia. During this period, Ming Dynasty also created a city that's exclusively resided for Nobles and High Government official called the Forbidden city.
Well think about it, Barnabas already parted from Paul. Paul didn't want to go with Mark. So that takes Paul completely off the list. So it was Barnabas and Mark who went.
The oath was administered by Robert R. Livingston.
Hope this helps.