Around 1400, Gian Galeazzo Visconti ruled much of northern Italy from which city, until he was blocked by the Florentines?

Around 1268, Roger Bacon wrote that which optical devices could be used to help people with weak eyesight? Which pharaoh became king of Egypt as a child around 1332 B.C. and is famous for the treasures of his tomb? The Dead Sea, whose shores are the lowest land on Earth's surface, is on which continent? In the 14th century, Adrianople became the capital of which empire, until Constantinople replaced it in 1453? Around 1400, the monk Tsongkhapa founded the Gelug, or "Yellow Hat," school of Buddhism in which region? Which Florentine artist painted "Venus and Mars" and "The Birth of Venus" in the 1480s? Around 1492, which teenage artist carved the marble relief "Battle of the Centaurs"? Around A.D. 150, which astronomer of Alexandria cataloged over 1,000 stars in his work the "Almagest"?