The Persian Empire was conquered by the Greeks led by Alexander the Great. Starting in the year 334 BC, Alexander the Great conquered the Persian Empire from Egypt all the way to the borders of India.
In information technology, a Uniform Resource Identifier (URI) is a string of characters used to identify a resource. Such identification enables interaction with representations of the resource over a network, typically the World Wide Web, using specific protocols.
By definition URL is a subset of URI [RFC2396]. URI contain URN and URL. Both URI and URL each have their own specific syntax that confers upon them the status of being either URI or URL. URN are for uniquely identifying a resource while URL are for locating a resource.