386 Sylvester II former opponent for the See at Reims, Arnulph, as the rightful archbishop His reputation suffered some criticism from historians for this change in policy After the death of Emperor Otto III, Sylvester returned to Rome, though he gained no temporal power from the competing factions of the city He established metropolitanates in Poland and Hungary and declared the ruler of Hungary to be a king and papal representative Sylvester wrote many works on mathematics and the physical sciences The people of Rome held him in high esteem as an exorcisor of the devil and a miracle worker Some historians claim he introduced Arabic numbers into the West and was the inventor of the pendulum clock Further reading: Cheetham, Nicholas Keepers of the Keys: A History of the Popes From St Peter to John Paul II New York: Scribner, 1983; Duffy, Eamon Saints & Sinners: A History of the Popes New Haven, CT: Yale University Press, 2002; Maxwell-Stuart, P G Chronicle of the Popes: The Reign-by-Reign Record of the Papacy From St Peter to the Present New York: Thames and Hudson, 1997 Russell James