[Footnote 68: _Nicolaus Coppernicus_ (Berlin, 1883-4; 3 vol.; Pt. I, Biography, Pt. II, Sources), by Dr. Leopold Prowe gives an exhaustive account of all the known details in regard to Copernicus collected from earlier biographers and tested most painstakingly by the documentary evidence Dr. Prowe and his fellow-workers unearthed during a lifetime devoted to this subject. (_Allgemeine Deutsche Biographie._) The manuscript authority Dr. Prowe cites (Prowe: I, 19-27 and footnotes), requires the double p in Copernicus's name, as Copernicus himself invariably used the two p's in the Latinized form _Coppernic_ without the termination _us_, and usually when this termination was added. Also official records and the letters from his friends usually give the double p; though the name is found in many variants--Koppernig, Copperinck, etc. His signatures in his books, his name in the letter he published in 1509, and the Latin form of it used by his friends all bear testimony to his use of the double p. But custom has for so many centuries sanctioned the simpler spelling, that it seems unwise not to conform in this instance to the time-honored usage.]
[Footnote 72: These facts would seem to justify the Poles today in claiming Copernicus as their fellow-countryman by right of his father's nationality and that of his native city. Dr. Prowe, however, claims him as a "Prussian" both because of his long residence in the Prussian-Polish bishopric of Ermeland, and because of Copernicus's own reference to Prussia as "unser lieber Vaterland." (Prowe: II, 197.)]
After the elementary training in the Thorn school,[74] the lad entered the university at Cracow, his father's former home, where he studied under the faculty of arts from 1491-1494.[75] Nowhere else north of the Alps at this time were mathematics and astronomy in better standing than at this university.[76] Sixteen teachers taught these subjects there during the years of Copernicus's stay, but no record exists of his work under any of them.[77] That he must have studied these two sciences there, however, is proved by Rheticus's remark in the _Narratio Prima_[78] that Copernicus, after leaving Cracow, went to Bologna to work with Dominicus Maria di Novara "non tarn discipulus quam adjutor." He left Cracow without receiving a degree,[79] returned to Thorn in 1494 when he and his family decided he should enter the Church after first studying in Italy.[80] Consequently he crossed the Alps in 1496 and was that winter matriculated at Bologna in the "German nation."[81] The following summer he received word of his appointment to fill a vacancy among the canons of the cathedral chapter at Ermeland where his uncle had been bishop since 1489.[82] He remained in Italy, however, about ten years altogether, studying civil law at Bologna, and canon law and medicine at Padua,[83] yet receiving his degree as doctor of canon law from the university of Ferrara in 1503.[84] He was also in Rome for several months during the Jubilee year, 1500.