Aleksander Bychowiec of Mogiła was a 19th century Polish noble and an amateur historian. Mogiła ( Polish for " Tomb " is a Polish coat of arms. The 19th century of the Common Era began on January 1, 1801 and ended on December 31, 1900, according to the Gregorian calendar Szlachta ( refers to the noble class in the Kingdom of Poland, the Grand Duchy of Lithuania (since 1569 semi-federal semi-confederal He is best known as the discoverer (and the name-sake) of the so-called Bychowiec Chronicle, a set of 16th century texts related to the history of the Grand Duchy of Lithuania. The Bychowiec Chronicle (also spelled Bykhovets, Bykovets or Bychovec) named the Letopis of the Grand Dukes of Lithuania is an anonymous 16th The Grand Duchy of Lithuania (Lietuvos Didžioji Kunigaikštystė old literary Lithuanian Didi Kunigiste Letuvos, Ruthenian: Wialikaje Kniastwa Litowskaje