Ivan Stojkovic de Corvatia
“Tractatus de Ecclesia”, written by Ivan Stojkovic de Corvatia (or Iohannes de Carvatia, also known as Jean de Raguse, 1390/95-1443), a professor at the University of Paris, was the first systematic tractate about the Church in the history of Catholic theology. Ivan Stojkovic also headed the delegation of the Council of Basel to Constantinople, aiming to negotiate the Ecumenical questions of the Eastern and Western Church. He wrote that he was from Dubrovnik, which was a Croatian city (de Ragusio quae civitas est in Charvatia).