noun which may take the genitive case particle 'no', noun
unparalleled in Japan, China and India; the best in the world
A classical set phrase originally referring to being the best among the three great ancient Asian civilizations. In modern use, it is a literary or hyperbolic way to say 'the best in the world' or 'unrivaled'. Often used in the pattern 三国一の～.
He was called the greatest swordsman in the world.
This castle is said to be the finest castle in the world.