Assertion: polo | /r/HasProperty | the sport of kings
Facets:
Source sentences:
text: To reinforce the idea that Polo is the sport of kings is the legend according to which even the Mongolian king Genghis Khan loved to play this game: it is probable, but not sure, that its diffusion in China took place thanks to him starting in 1211.
text: Polo has been called "the sport of kings".