Assertion: continent's border | /r/HasProperty | redefined since its first conception
Facets:
value: several times
type: TEMPORAL
value: in classical antiquity
type: TEMPORAL
Source sentences:
text: Prior to the adoption of the current convention that includes mountain divides, the border between Europe and Asia had been redefined several times since its first conception in classical antiquity, but always as a series of rivers, seas, and straits that were believed to extend an unknown distance east and north from the Mediterranean Sea without the inclusion of any mountain ranges.