YOU SAID:

once upon a time there was a princess who was the daughter of mighty king

INTO JAPANESE

昔々、強大な王様の娘であるお姫様がいました

BACK INTO ENGLISH

Once upon a time there was a princess who was the daughter of a mighty king

INTO JAPANESE

昔々、強大な王の娘である王女がいました

BACK INTO ENGLISH

Once upon a time there was a princess who was the daughter of a mighty king