In 1536 becomed secretary of Gniezno archbishop Andrzej Krzycki, and meet such scholars like Jan Dantyszek (Johannes Dantiscus), Stanisław Hozjusz (Stanislaus Hosius). At that time wrote elegyies: Ad Andream Cricium and De Cricio Cracovia eunte as well as Vitae archaepiscoporum Gnesnensium for his patron. After Archbishop Krzycki died, worked under patronage of the count Piotr Kmita and wrote Querella Reipublicae Regni Poloniae i Ad Polonos proceras. In 1538 Count Sobieński sponsored his studies in Padua, where he met Piotr Myszkowski, Filip Padniewski and Andrzej Zebrzydowski. 22 july 1540 graduated from philosophy with designation of a doctor. Pope Paul III awarded him with prestigious title of poeta laureatus.
During his travel to Italy he get ill on hydrops and soon camed back to Poland. Didn`t wanted to work for the count Kmita no more, and devote himselve to the work as a parson in Gołaczów near Olkusz. In 1541 he wrote collection of elegyies "Tristium liber" in which mentioned his future death, especially Elegy VII De se ipso ad posteritatem (About myself to posterity). Died in january 1543, his last work, Epithalamium Serenissimo Regi Poloniae, Sigismundo Augusto, was found by his hiers Jan Antonin and Augustinus Rotundus who diceded to publish it.
Janicjusz, a humanist, an expert on the ancient heritage, mastered his poetic technique at the highest possible level. At the same time, however, he approached the topics originally, which is clearly seen in the fragments dedicated to his native nature, the past and the present of Poland. The personal tone of his poetry was a new element in Polish poetry. He was the first poet to write so much about himself and his relatives, about the dignity and pride of the poet.
Apart from elegies, epigrams were the most common genre in the poet’s writing. Janicjusz expressed himself in various kinds of this genre: epitaphs, stemmata (poems on coats of arms) and in imagery poems similar to emblematic compositions. Using the examples of Martial, Propertius and Catullus, he undertook various erotic, laudatory, humorous and satirical motifs. There are two series of his epigrams: Vitae archiepiscoporum Gnesnensium and Vitae regum Polonorum. The first consists of 43 poems presenting the lives of the Gniezno archbishops, and was created owing to archbishop Krzycki. The characteristics of the clerical dignitaries are generally positive, however, there is some criticism or humorous overtones. The second series consists of 44 biograms of legendary (starting with Lech I) and historic rulers of Poland (starting with Mieszko I), this collection was initiated by Kmita.
Querela Reipublicae Regni Poloniae is of a completely different character. Poem, which refers to the events of the nobles’ rebellion known as the Chicken War, through the words of personified Poland, the artist complains about the nobility, magnates especially, their internal quarrels and their private interests.
A wedding song, Epithalamium Serenissimo Regi Poloniae, Sigismundo Augusto, written for the planned marriage of King Zygmunt August and Elżbieta, a daughter of Ferdinand I, Holy Roman Emperor who was then King of the Bohemia and of Hungary, was the last work of Janicjusz. It contains two poems comprising over 500 verses as a whole. The first one, addressed to the King Zygmunt I the Old, was invented as a praise of the monarch and his military achievements among other things. The second, is a true wedding song and sings the praises of the bride and the groom.