Vytautas (Lithuanian:  Vytautas Didysis (help·info), Belarusian: Вітаўт, Polish: Witold Kiejstutowicz, Rusyn: Vitovt, Latin: Alexander Vitoldus, Italian: Vito il Grande); styled "the Great" from the 15th century onwards; c. 1350 – October 27, 1430) was one of the most famous rulers of medieval Lithuania. Vytautas was the ruler (1392–1430) of the Grand Duchy of Lithuania which chiefly encompassed the Lithuanians and Ruthenians. He was also the Prince of Hrodna (1370–1382) and the Prince of Lutsk (1387–1389), postulated king of Hussites.

In modern Lithuania, Vytautas is revered as a national hero and was an important figure in the national rebirth in the 19th century. Vytautas is a popular male given name in Lithuania. In commemoration of 500 years of Vytautas' death Vytautas Magnus University was named after him. Monuments in his honour were built in many towns in the independent Republic of Lithuania during the interwar period, 1918–1939.

Vytautas' father, Kęstutis, and his uncle Algirdas, were brothers and did not compete for power. Algirdas was the Grand Duke of Lithuania, and Kęstutis was primarily responsible for defense against the Teutonic Knights. However, after Algirdas' death in 1377, his son Jogaila, became Grand Duke. The harmonious relationship of his father and uncle ended, and a struggle for power between them ensued. In 1380, Jogaila signed the secret Treaty of Dovydiškės with the Teutonic Knights against Kęstutis. When Kęstutis discovered this in the following year, he seized Vilnius, imprisoned Jogaila, and made himself Grand Duke. However, Jogaila managed to escape and raised an army against Kęstutis, and his son Vytautas. The two opposing sides confronted each other but never engaged in battle. Kęstutis was ready to negotiate, but he and Vytautas were arrested and transported to Kreva Castle. One week later, Kęstutis was found dead. Whether he died of natural causes or was murdered is still a matter of debate amongst historians.

Professor Vytautas Landsbergis  pronunciation (help·info) (born 18 October 1932) is a Lithuanian conservative politician and Member of the European Parliament. He was the first head of state of Lithuania after its independence declaration from the Soviet Union, and served as the Head of the Lithuanian Parliament Seimas. Professor Landsbergis is an intellectual who has been active in Lithuania's political arena for almost two decades, and is a notable politician who helped contribute to the demise of the Soviet Union. He has written twenty books on a variety of topics, including a biography of Mikalojus Konstantinas Čiurlionis, as well as works on politics and music. He is a founding signatory of the Prague Declaration on European Conscience and Communism, and a member of the international advisory council of the Victims of Communism Memorial Foundation.

Vytautas Landsbergis was born in Kaunas, Lithuania. His father was the famous architect Vytautas Landsbergis-Žemkalnis and his mother, ophthalmologist Dr. Ona Jablonskytė-Landsbergienė, was a Righteous Among the Nations who in 1944 sheltered a Jewish teenager in the family home. In 1952 he placed third in the Lithuanian chess championship, after Ratmir Kholmov and Vladas Mikėnas. In 1955, he graduated from the Lithuanian Conservatory of Music (now Lithuanian Academy of Music and Theatre). In 1969, he wrote his thesis for his PhD degree. In 1978, he became a Professor at the Lithuanian Conservatory. From 1978 to 1990, he was a professor at both the Lithuanian Conservatory and the Vilnius Pedagogical University. In 1994, he wrote a thesis for his doctor habilitus degree.