Written in Latin by a 26-year-old Frenchman in less than a year, it is a book of 516 pages. Published in Switzerland and dedicated to the French king from whom he was fleeing, it is the most important theological work of the Reformation.
In the face of the hundreds of Christian confessions that exist today, the ecumenical efforts of the last decades have invariably raised some complementary and equally legitimate questions: Is Jesus' desire "that all of them may be one" (John 17:21) possible?
At the beginning of the 15th century, the threat of the Ottoman Empire to Eastern Europe was a painful certainty. The last Byzantines, aware of the ensuing disaster, called on Western aid, seeking political union with the Roman Catholic Church.