During the Renaissance there was a return to the Latin of classical times, called for this reason Neo-Latin. This purified language continued to be used as the "lingua franca" among the learned throughout Europe, with the great works of Descartes, Francis Bacon, and Baruch Spinoza all being composed in Latin. Among the last important books written primarily in Latin prose were the works of Swedenborg (d. 1772), Linnaeus (d. 1778), Euler (d. 1783), Gauss (d. 1855), and Isaac Newton (d. 1727), and Latin remains a necessary skill for modern readers of great early modern works of linguistics, literature, and philosophy.