Rotundus supported Lithuanian statehood against claims of the Polish Crown. He was progenitor of mythical deductions and his passion were
noble families. Rotundus contributed to the second and the third
Statutes of Lithuania. He collaborated on these acts together with
Peter Roisius,
Ostafi Wołłowicz and
Mikołaj "the Black" Radziwiłł. He personally translated the Second Statute into
Latin and added his own study
Epitome principum Lituaniae (Lithuanian Dukes Epitome) as a foreword. In this study Rotundus promoted the idea, that Lithuanians together with their Dukes have roots in the ancient
Roman Empire, from the
mythical house of
Palemonids. Similar theories were raised by
Jan Długosz, but both were lacking evidences to support this theory. Rotundus was probably contributing to the second edition of the
Lithuanian Chronicles. He claimed that Publius Libonus, Roman commander who fled from
Julius Caesar and supposedly settled down in Lithuania, was ancestor of Lithuanian and
Ruthenian rulers. Supposedly the name of
Livonia comes from
Libonus. In his opinion, this explained why Latin language was common in the
Polish–Lithuanian Commonwealth and also served to support
sarmatism ideals. Rotundus was a close friend to other Vilnius renaissance scholars like physician
Jan Antonin () and a poet
Klemens Janicki (), after the latter died, both published Ianicius artworks. In 1564 on personal request by
Mikołaj "the Black" Radziwiłł Rotundus wrote
Rozmowy Polaka z Litwinem (
Conversations of Pole with Lithuanian) – a polemic work, where he defended Lithuania's dignity against insults by Polish author
Stanisław Orzechowski in
Quincunx (1554), "
...against disgraceful and mistaken Stanisławs Orzechowski writing, which innocent famous Lithuanian Duchy insulted...". Although it is recognized as Rotundus personal work, after thorough analysis of the work Lithuanian historian
Ingė Lukšaitė suggested that it was a collective work by several authors. == Bibliography ==