The Sherpas originated in Kham in eastern Tibet, 800 miles north of Everest. Some time around the 15th Century they were forced out of their homeland, perhaps by political changes or by pressure from military forces. Possibly, like other pilgrims, they sought religious freedom so that they could practice their own version of Buddhism.
The Sherpas crossed a low mountain pass to the west of Everest and found the Khumbu suited their needs. They brought with them their animals, their culture, and their religion. More than any other group, the Sherpas are the people who have come to be associated with the mountain they call Chomolungma - known to most people as Everest.