In: Volume 1 Dawn of Ecumenism | Part II. Prehistory: The Challenges of Modernity
1 Introduction
In 1856, when Fr. Jean-Xavier (Ivan Sergeyevich) Gagarin, a Russian Orthodox who had converted to Catholicism and become a Jesuit, chose primary sources for the appendices of his book, La Russie sera-t-elle catholique?, he coul…