The main purpose of this article is to provide some new texts for studying the history of Catholic Church in XIX century. It is a small contribution to the history of Jesuits, but also the history of Poland, Greece and Turkey. The study concerns a very turbulent period in the history of the Society of Jesus, namely the rebirth of the Society in Europe and in the World. It was a very challenging time in the European history as Greece was (...) slowly regaining its independence, the Polish-Lithuanian Commonwealth was under the oppression of its occupying powers and was suffering the aftermath of its unsuccessful insurrections, and Turkey was trying to suppress the independence movements. Expelled from Russia and Prussia, the Jesuits arrived to the islands of the Aegean Sea, where they undertook the pastoral work of their fellow brethren from the times before the suppression of the Society in 1773. The research presented in this article was carried out in the Jesuit’s archive in Athens and deals primarily with “Polonica”. It is the first attempt to overview the archive under such aspect. During my research trip to Athens in 2018, Father Gabryel Marangos, the Director of Jesuit Archive in Athens, granted me the access to the collection of letters of the Polish Jesuits, which are preserved in the Athenian Archive of SJ. The method of this research was to check the files which directly regard the letters of Father Tadeusz Kuczyński. According to the Director of Athenian Archive there are more documents related to the subject, but they are dispersed among other files. The first part of the article is a brief overview of the history of Jesuits in Greece, whereas the second one is a presentation of some new sources, such as the letters of Father Tadeusz Kuczyński SJ. It is not the whole Polonica from the Athenian Archive and the remaining letters, the fragments of personal diaries, the Community Diary, Books of Charity, the Books of Bell Ringing will be presented in a coming book. The research has a pioneering character and has to be followed by further studies. In this place I would like to express my gratitude to the Greek and French Jesuits for gathering and preserving these documents. I also extend my gratitude to the governing body of the Ignatianum University for covering the costs of the research. (shrink)