Four boarders at his parents' apartments became Chopin's intimates: Tytus Woyciechowski, Jan Nepomucen Białobłocki, Jan Matuszyński and Julian Fontana;
Of the individuals that became intimate with Frédéric during their stay at the family apartments, which two became part of Frédéric's social environment in Paris?
Jan Matuszyński and Julian Fontana