High in the icy Indian Himalayas, a long-isolated people recall origin myths of millennia-old migrations from afar -- an identity in disputed lands twisted today by politics. The Brokpa people of Ladakh have no written language, practice a culture of polygamy, and have their own calendar. The most cherished ballad of the Brokpa, some 6,000 of whom live in a rugged mountain valley of the Indus river, is the "song of history". A new verse is added every 12 years, a cycle which counts as just one "year" in their calendar. Tsering Gangphel, 85, said it details Brokpa legends that...