About: http://webisa.webdatacommons.org/286974766

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	this vast empire was guarded by one frontier, a series of natural and man-made barriers, including Hadrian's Wall.
http://www.w3.org/ns/prov#wasQuotedFrom	ebooks.com