The publication of this model in his book De revolutionibus orbium coelestium just before his death in 1543 is considered a major event in the history of science, triggering the Copernican Revolution and making an important contribution to the Scientific Revolution. Copernicus was born and died in Royal Prussia, a region that had been a part of the Kingdom of Poland since 1466. In 1517, he derived a quantity theory of money – a key concept in economics – and, in 1519, formulated a version of what later became known as Gresham's law.