Assertion: polo | /r/CapableOf | originate among iranian tribes
Facets:
value: sometime before darius
type: TEMPORAL
Source sentences:
text: Some scholars believe that polo originated among the Iranian tribes sometime before Darius-I and his cavalry forged the first great Persian Empire in the 6th century B.C.
text: However, many scholars believe that polo originated among the Iranian tribes  sometime before Darius