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 "Portuguese missionaries Jesuit Father António de Andrade and Brother Manuel Marques first reached the kingdom of Gelu in western Tibet in 1624 and was welcomed by the royal family who allowed them to build a church later on.". Is that enough to answer the question?