Proper noun
Ten Lost Tribes
(historical) The ten of the Twelve Tribes of Israel that were said to have been exiled from the Kingdom of Israel after its conquest by the Neo-Assyrian Empire.
But no ancient author mentions such a transfer of Israelites further east, or no ancient extra-Biblical texts refer to the Ten Lost Tribes at all. Source: Internet
There have been many legends over the centuries of descent from the Ten Lost Tribes after groups converted to Christianity and Islam. Source: Internet