The Northern Renaissance began around 1450 as influences from Italy spread outside its borders following periods of war and plague. A major proponent was French King Francis I from 1515-1547, who embraced humanism and sponsored the arts. He lured Leonardo da Vinci to France and greatly expanded the royal library. Printing presses, invented by Johann Gutenberg, mass-produced texts and spread Renaissance ideas more widely. Literature took on a Christian humanist bent, emphasizing human freedom within Christianity. Art emulated Italian techniques like perspective and realism as seen in the works of artists like Durer, van Eyck, and Holbein.