Moctezuma was the ninth Tlatoani of Tenochtitlan and the sixth Huey Tlatoani or Emperor of the Aztec Empire, reigning from 1502 or 1503 to 1520. After his coronation he set up thirty-eight more provincial divisions, largely to centralize the empire. He sent out bureaucrats, accompanied by military garrisons. They made sure tax was being paid, national laws were being upheld, and served as local judges in case of disagreement. In 1517, Moctezuma received the first reports of Europeans landing on the east coast of his empire; this was the expedition of Juan de Grijalva who had landed on San Juan de Ulúa, which although within Totonac territory was under the auspices of the Aztec Empire.