Circa 1324, July
Marsilius of Padua completes his political treatise "Defensor Pacis" (Defender of Peace). The book contained radical anti-papal views. Advocating for popular sovereignty, asserting that the source of all political power and law is the people, and argued for the separation of church and state, severely limiting the power of the papacy and clergy in secular matters.
Many believe that some of his ideas were later adopted by Luther and Calvin. His writings were condemned as heretical by the Catholic Church, and he spent the latter part of his life under the protection of the Holy Roman Emperor, Louis IV.. More