Nicolaus Copernicus surviving primary documents on the early years of Copernicus's childhood and education. Copernicus biographers assume that Watzenrode first sent young Copernicus to St. John's School, at Toruń, where he himself had been a master. Later, according to Armitage, the boy attended the Cathedral School at Włocławek, up the Vistula River from Toruń, which prepared pupils for entrance to the University of Kraków, Watzenrode's alma mater in Poland's capital. In the winter semester of 1491–92 Copernicus, as "Nicolaus Nicolai de Thuronia", matriculated together with his brother Andrew at the University of Kraków (now Jagiellonian University). Copernicus began his studies in the
Northern Renaissance of European history. Many scholars see it as a unique time with characteristics all its own. A second group views the Renaissance as the first two to three centuries of a larger era in European history usually called early modern Europe, which began in the late fifteenth century and ended on the eve of the French Revolution (1789) or with the close of the Napoleonic era (1815). Some social historians reject the concept of the Renaissance altogether. Historians also argue over how much the Renaissance differed from the Middle Ages and whether it was the beginning of the modern world,