The present article focuses on the person of the Prague Archbishop Cardinal Schwarzenberg at the first Vatican Council - as he was perceived and described by his contemporaries - indirect participants in the first Vatican Council and observers who reported to the media on the developments in the Council: the first part deals with the letters from Rome by a Munich Professor Ignaz von Döllinger that were published in a German newspaper Augsburger Allgemeine Zeitung; the second part focuses on the letters from Rome by Thomas Mozley, an Anglican spiritual and correspondent of The Times. Cardinal Schwarzenberg was one of the leading personalities who were opposed to the proclamation of papal infallibility at the Council - the article follows his activities in the course of the Council as described by the above-mentioned authors.