And as you can see in this map here, he didn't live in what we call Greece proper today. He lived in Alexandria, a city established by Alexander the Great. And this is during the Hellenistic period, where all of the territory that had, or most of the territory that had been conquered by Alexander the Great, was still ruled by his successors. Egypt was ruled by Ptolemy, establishing the Ptolemaic dynasty in the time of Euclid. And Euclid lived in that great center of learning in the arts, Alexandria, which even exists today. And he is most famous for his elements. This is a much later printing of his elements, of Euclid's elements.