Nicolaus Copernicus of his life. At the instance of Roger Boscovich, the Catholic Church's 1758 "Index of Prohibited Books" omitted the general prohibition of works defending heliocentrism, but retained the specific prohibitions of the original uncensored versions of "De revolutionibus" and Galileo's "Dialogue Concerning the Two Chief World Systems". Those prohibitions were finally dropped from the 1835 "Index". There has been discussion of Copernicus' nationality and of whether it is meaningful to ascribe to him a nationality in the modern sense. Nicolaus Copernicus was born and raised in Royal Prussia, a semiautonomous and polyglot region of the Kingdom of Poland. He was
Nicolaus Copernicus several Kraków astronomers with whom he collaborated in 1515–30 in observing eclipses. Tycho Brahe would include a fragment from the "Commentariolus" in his own treatise, "Astronomiae instauratae progymnasmata", published in Prague in 1602, based on a manuscript that he had received from the Bohemian physician and astronomer Tadeáš Hájek, a friend of Rheticus. The "Commentariolus" would appear complete in print for the first time only in 1878. In 1510 or 1512 Copernicus moved to Frombork, a town to the northwest at the Vistula Lagoon on the Baltic Sea coast. There, in April 1512, he participated in the election of Fabian