Nicolaus Copernicus Prussia also resisted the Polish crown's efforts for greater control over the region. "Encyclopædia Britannica", "Encyclopedia Americana", "The Concise Columbia Encyclopedia", "The Oxford World Encyclopedia", and "World Book Encyclopedia" refer to Copernicus as a "Polish astronomer". Sheila Rabin, writing in the "Stanford Encyclopedia of Philosophy", describes Copernicus as a "child of a German family [who] was a subject of the Polish crown", while Manfred Weissenbacher writes that Copernicus's father was a Germanized Pole. There are additional arguments for Kopernik's Polish descent on his father's side. Kopernik's Y-DNA haplogroup, R1b L51, is found in southern Poland (in Silesia, where his father
Nicolaus Copernicus common in the period, the spellings of both the toponym and the surname vary greatly. Copernicus "was rather indifferent about orthography". During his childhood, about 1480, the name of his father (and thus of the future astronomer) was recorded in Thorn as "Niclas Koppernigk". At Kraków he signed himself, in Latin, "Nicolaus Nicolai de Torunia" (Nicolaus, son of Nicolaus, of Toruń). At Bologna, in 1496, he registered in the "Matricula Nobilissimi Germanorum Collegii, resp. Annales Clarissimae Nacionis Germanorum", of the "Natio Germanica Bononiae", as "Dominus Nicolaus Kopperlingk de Thorn – IX grosseti". At Padua he signed himself "Nicolaus Copernik", later