Quote Originally Posted by Zarky View Post
There's the 1 starting Nanban Trade Port in the eastern central of Kyushu and Shimazu start with the capability of building another Nanban Trade Port in Satsuma (haven't tested if you still can after capturing that 1 province). So you could even get 2 Nanban ports.
I tried that, and no you cannot build a nanban port once you acquire a province with one.