Theon of Alexandria, was a Greek scholar and mathematician who lived in Alexandria, Egypt, his daughter was Hypatia, a Greek mathematician, astronomer, inventor, and philosopher in Egypt, then a part of which location?
Hypatia Hypatia ( ; ; Greek: Ὑπατία "Hupatía"; born 350–370; died 415 AD), often called Hypatia of Alexandria, was a Greek mathematician, astronomer, inventor, and philosopher in Egypt, then a part of the Eastern Roman Empire. She was the head of the Neoplatonic school at Alexandria, where she taught philosophy and astronomy.
Stone Tower (Ptolemy) Ptolemy, the Greco-Egyptian geographer of Alexandria, wrote about a "Stone Tower" (λίθινος πύργος in Greek, "Turris Lapidea" in Latin) which marked the mid-point on the ancient Silk Road – the network of overland trade routes taken by caravans between Europe and Asia. It was the most important landmark on this route, where caravans stopped on their difficult and dangerous journeys to allow travellers to take on provisions, rest, and trade goods before continuing on.