Assertion: flax | /r/HasProperty | grown since the time of the roman empire
Facets:
Source sentences:
text: In her research she discovered a landscape stretching from Normandy through Belgium to the southern part of the Netherlands, where flax has been grown at least since the time of the Roman empire and possibly as early as 500 BCE – the rough date of the first-known use of the crop in the form of linen sails by Phoenician sailors.