Adam Mickiewicz’s Pan Tadeusz (in English: Sir Thaddeus, or the Last Lithuanian Foray), the national epic poem, was first published in June 1834. It was perceived as a idyllic work, full of happiness and very ideal heroes. However, one of the most problem of this poem is treason! It is very important to put a question: what is treason in the strict sense of the word? There are a lot of kinds of treason or only one? Is it possible to betray own country on account of favouriting strange fashion, customs or painting? In Pan Tadeusz Mickiewicz intended to stand up for the Polish tradition. He had a high opinion of loyalty, steadiness and the selfless sense of duty.