De moribus tartarorum, lituanorum et moscorum

The work, which was originally dedicated to King of Poland and Grand Duke of Lithuania Sigismund II Augustus, survived only in ten fragments that were first published in 1615 by Johann Jacob Grasser in Basel, Switzerland.

The work is neither a chronicle nor a travel book, but rather a political essay which is critical of the author's motherland (Grand Duchy of Lithuania) and overly praises Muscovy and the Crimean Khanate for their centralized governments and united subjects.

[2] The author examines the reasons behind Lithuania's decreasing power and influence, criticises the nobility and high Catholic officials, and advocates for a strong centralized government.

[1] Michalo supports the theory that the Lithuanian nation was founded by the legendary dynasty of the Palemonids from the late Roman Empire, and he proposes introducing Latin as the Grand Duchy's official language, thereby restoring forgotten ancestral traditions.

Polish historian Jerzy Ochmański [pl] has proposed notary Vatslav Nikolayevich (Vaclovas Mikalojaitis or Wacław Nikołajewicz, c. 1490 – c. 1560) from Maišiagala.