The last Admiral was Zheng He. My brother has traveled to China as an assistant on tours so he got free trips for many years. He has visited many private museums around China and even got permission to travel to Tibet once. I asked him about why the Chinese had stopped the exploration trips and his reply was that it was costing the Empire more money than the returns so the trips ended. I have read several books from the library about that topic and wondered why the Europeans became the great navigators leaving the Chinese behind.