Count Konstanty Tyszkiewicz was a Polish-Lithuanian noble, archaeologist and ethnographer.
He studied the history of Grand Duchy of Lithuania. He was also the brother of Eustachy Tyszkiewicz. Wikipedia
Born: June 17, 1806, Lahoysk, Belarus
Died: 1868 (age 62 years), Minsk, Belarus
Parents: Pius Tyszkiewicz
Great-grandparent: Mykolas Jonas Tiškevičius Logoiskis
Grandchild: Józef Tyszkiewicz
Grandparent: Felicjan Tyszkiewicz
Descendants: Oskar Tyszkiewicz, Józef Tyszkiewicz, and Maria Tyszkiewicz