It is not Western-only. Don't forget the Eastern route to Arabian countries, for example. *Lunatic*, n. One whose delusions are out of fashion.
Actually, there are also other cases in the Amazonia..a s far as I think I remember (I am not sure, in a word). Or int he ancient world with different connotations.
But, very relevant point, a general notion of slavery can be found in other places and time frames.
A pleasure I therefore claim to show, not how men think in myths, but how myths operate in men's minds without their being aware of the fact. Levi-Strauss, Claude