Is it possible for Taiwan to be a Buddhist or Hindu territory or at least have an Aristocracy that adheres to Buddhist or Hindu religions.
Champa was preceded in the region by a kingdom called Lin-yi (林邑, Middle Chinese *Lim Ip) or Lâm Ấp (Vietnamese) that was in existence from 192 AD, but the historical relationship between Lin-yi and Champa is not clear. Champa reached its apogee in the 9th and 10th centuries. Thereafter began a gradual decline under pressure from Đại Việt, the Vietnamese polity centered in the region of modern Hanoi. In 1471, Viet troops sacked the northern Cham capital of Vijaya, and in 1697 the southern principality of Panduranga became a vassal of the Vietnamese emperor. In 1832, the Vietnamese emperor Minh Mạng annexed the remaining Cham territories.The capital city is now heritage listed.
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Looks like they did not get down to VungTai/Saigon, except to
raid and war, as well as in this map having deeper inroads in
the interior regions. Surely it was a loose arangement over
the tribes, still.