I want to know the answer to the following question:
When was Christianity introduced to Rudok, Ladakh, and Tsang?
All the background I'm provided with is that "Later on, Christianity was introduced to Rudok, Ladakh and Tsang and was welcomed by the ruler of the Tsang kingdom, where Andrade and his fellows established a Jesuit outpost at Shigatse in 1626.". Is that enough to answer the question?