Uladzimir Karatkievich left a great legacy for Belarusians. He opened up a new and completely different Belarus, looking into the country’s historic past. He enriched Belarusian literature with new genres and themes. Thus, it is not without reason that he became a person of classic note while still alive. U.Karatkievich gained even greater recognition once he passed on, i.e., with the passage of time within our collective Belarusian mind he amassed greater recognition as a discoverer of Belarusian history and exquisite master of our language, in general as one of the most outstanding representatives that our nation has known. Today there is no doubt in our minds concerning our total appreciation of him in this capacity. His diary occupies a special place among his legacy of rich and variated genres. Although not extensive in length, covering a period slightly less than a year, it has proven to be an unusually important source of study related to the 20th century centering research on the history of Belarus during the years of the Grand Duchy of Litva and Russian Empire. In some sense this article plays out its unique role but also can be seen as an introduction to further historic research.