Quick question about conquistadores

Hi there!
Could please someone tell me, when can I buy conquistadores with the Portugese? Aren't they supposed to show up, when the aventuros?

I am about 90% sure that they are only available to Spain and then only in the new world. So unless you have a castle or city there they won't show up.

They are available to Portugal as well but only in the New World with wooden walls (2nd level).

Thank you for the quick answers!