Don Grey
Banned
And part of the process is to give the conquered people a stake in your own culture. This is what I mean by representation. They might think of themselves as cultural Y, but you can make it so by the time of their grand kids they just think of themselves as part of culture X. It's a way to culturally genocide theirs with less resistance. Plus there's usually a few elements that you can graft on to yours that are useful.
Yes that did wonders for the ottomans. Every one had there own millet religious cultural and linguistic freedom and were alowed to run there own regions. And now all the former countrymen of the ottoman empire are such good friends.