In FBNFH, the location is only in the Mysterious Planet ( Fushigi Boshi ).
There are 7 kingdoms in Fushigi Boshi which is;

-Sunny Kingdom
-Water Kingdom
-Jewel Kingdom
-Moon Kingdom
-Windmill Kingdom
-Flame Kingdom
-Seed Kindom

The prince and princess in each kingdoms are;

Sunny Kingdom;

Princess:
-Fine *
-Rein *

Water Kingdom;

Princess:
-Mirlo *
Prince:
-Narlo

Jewel Kingdom;

Princess:
-Altezza
Prince:
-Bright *

Moon Kingdom;

Princess:
-Milky
Prince:
Shade *

Windmill Kingdom;

Princess:
-Sophie *
Prince:
-Auler *
( They have the same age but despite of the maturity, I guess it's Auler )

Flame Kingdom;

Princess:
-Lione *
Prince:...