Polo, MarcoMedieval Europe's greatest explorer and travel writer, Marco Polo, probably was born in Venice about 1254. He may have been about six years old when his father, Niccolò, and his uncle Maffeo traveled to the East, where they became the first Europeans to reach China, or as they called it, Cathay. They returned to Venice in 1269, with a request from the great khan, Kublai, written in Turkish and addressed to the pope, expressing the khan's interest in Christianity and inviting 100 learned men to visit his empire and provide instruction in Western religion and science...