The
Grand Duchy of Lithuania had
close relations with the
Kingdom of Poland since
1385. Despite this, the Lithuanians frequently manoeuvred for more political room with regard to Poland by maintaining a separate office of the
Grand Duke of Lithuania, the
Sejm, the
Lithuanian Council of Lords, and other institutions. (pictured) and his supporters Lithuanian nobles political and military efforts strengthened the statehood of the Grand Duchy of Lithuania, preserved separate monarchial institution of the Grand Duke of Lithuania and management organization of the Grand Duchy of Lithuania The Union of Krewo laid the foundations for the Polish nobles to request termination of Lithuania's statehood and complete integration of Lithuania to Poland. The 1381–1384 Lithuanian Civil War ceased with the
Ostrów Agreement, signed on 4 August 1392, according to which Vytautas the Great regained control of the
Duchy of Trakai, other lands of his father
Kęstutis, and was granted the right to rule
Vilnius, the capital city of the Grand Duchy of Lithuania, as
regent and
vassal of the King of Poland and Grand Duke of Lithuania Władysław II Jagiełło, however Vytautas the Great soon began consolidating his reign as Grand Duke of Lithuania, not as regent. In the late 14th century a set of three acts were passed in Vilnius, Grand Duchy of Lithuania, and they were confirmed by the Polish Crown Council in
Radom, Kingdom of Poland in 1401 (see:
Pact of Vilnius and Radom), according to which the Kingdom of Poland legally confirmed the
sovereignty of the Grand Duchy of Lithuania and recognized Vytautas the Great as the Grand Duke of Lithuania () until his death, but henceforth Władysław II Jagiełło held a higher monarchial title Supreme Duke of Lithuania (). On 2 October 1413 in the Polish town
Horodło the
Union of Horodło was concluded where the first act was signed by Władysław II Jagiełło, King of Poland, and Vytautas the Great, Grand Duke of Lithuania, the second and third acts were composed by the Polish nobility (
szlachta) and Lithuanian nobility
boyars, respectively, which amended the earlier Polish–Lithuanian unions of Krewo and Vilnius–Radom, politically Lithuania received more
autonomy as, after the death of Vytautas the Great, the Lithuanian nobles were permitted to choose another Grand Duke of Lithuania instead of passing this title to Władysław II Jagiełło or his heir, and prevented the Polish nobles aspirations to incorporate the Grand Duchy of Lithuania into the Kingdom of Poland. However, the Union of Horodło intensified the
Polonisation of the Grand Duchy of Lithuania as it adopted the Polish institutions (castellans and
voivodes) and forty-seven selected Lithuanian nobles were adopted by Polish families and granted
Polish coats of arms. The royal coronation of Vytautas the Great was suggested by
Sigismund, Holy Roman Emperor, as a result of Lithuanian nobles diplomatic efforts following the 1398
Treaty of Salynas and initially during the Congress of Lutsk was also supported by Polish King and Supreme Lithuanian Duke Władysław II Jagiełło, however it was opposed by Polish nobles, Polish Royal Secretary
Zbigniew Oleśnicki and eventually pressurred by them Władysław II Jagiełło cancelled his initial approval for the royal coronation of Vytautas the Great. Vytautas the Great sought the royal coronation as the King of Lithuania in the
Vilnius Cathedral to strenghten the sovereignty of the Grand Duchy of Lithuania and to dismiss the Polish nobles aspirations to incorporate the Grand Duchy of Lithuania into the Crown of the Kingdom of Poland, however Vytautas the Great died on 27 October 1430 before his royal
crown arrived to the Grand Duchy of Lithuania. Sigismund Kęstutaitis initially supported Švitrigaila's struggle with Poland, but after the
coup d'état against Švitrigaila (supported by Poland and a part of Lithuanians) and becoming the new Grand Duke of Lithuania he concluded the
Union of Grodno (1432), according to which he ruled the Grand Duchy of Lithuania as regent of Władysław II Jagiełło and promised not to seek the Lithuanian royal crown for himself and his son
Michael Žygimantaitis. Nevertheless, Sigismund Kęstutaitis in 1438–1439 sought to form an anti-Polish coalition with
Albert II of Germany by seeking to annul his earlier agreements with Poland, but was assasinated in 1440. It manifested Lithuania as a sovereign state and its ruler Casimir IV Jagiellon stressed himself as a "free lord" (
pan – dominus). , who refused to further participate in the Polish–Lithuanian Union negotiations when the Polish nobles raised demands of Lithuania's incorporation into Poland per union in 1569 The
Lithuania–Poland relations only grew closer when both states joined the
Polish–Lithuanian Commonwealth in
1569. In 1563–1564, Lithuanian Grand Marshal
Mikołaj Radziwiłł the Black, known for resolutely defending the
sovereignty and
territorial integrity of the Grand Duchy of Lithuania, led Lithuanian delegation which travelled to the
Sejm of the Kingdom of Poland in
Warsaw due to Lithuanian military failures in the
Livonian War and accepted to conclude only a limited
union of Lithuania and Poland without the unification of the two countries into one country, but it was not concluded and Mikołaj Radziwiłł the Black died on 28 May 1565. While further negotiating the closer Polish–Lithuanian Union during the Sejm held in
Lublin since 10 January 1569 the highest Lithuanian delegation officials, including the head of delegation Lithuanian Grand Chancellor
Mikołaj Radziwiłł the Red, Lithuanian Vice-Chancellor
Eustachy Wołłowicz, Samogitian Elder
Jan Hieronimowicz Chodkiewicz, Kievan Voivode
Konstanty Wasyl Ostrogski, sought to maintain the statehood of the Grand Duchy of Lithuania, demanded for a separate Lithuanian parliament, separate proclamation in Vilnius of the Grand Duke of Lithuania and that joint Polish–Lithuanian parliament sessions be held alternately in Lithuania and Poland, while the Polish senators and members of parliament treated earlier Polish–Lithuanian Union acts as Lithuania's incorporation into Poland and demanded to conclude the Polish–Lithuanian Union as such. As monarch
Sigismund II Augustus demonstrated support for the Polish nobles demands and transferred a part of the Grand Duchy of Lithuania territories to the Crown of the Kingdom of Poland (
Kiev Voivodeship,
Podolian Voivodeship,
Bracław Voivodeship,
Volhynian Voivodeship,
Podlaskie Voivodeship), the head of the Lithuanian delegation Mikołaj Radziwiłł the Red refused to further participate in the Polish–Lithuanian Union negotiations and he was replaced by Jan Hieronimowicz Chodkiewicz as the head of the Lithuanian delegation. Nevertheless, Mikołaj Radziwiłł the Red refused to sign the 1569 Union of Lublin, viewed it as the funeral and eternal destruction of a free and independent state of the Grand Duchy of Lithuania, and following the death of monarch Sigismund II Augustus sought to decrease the consequences of the 1569 Union of Lublin. , one of the main initiators of the 1655
Swedish–Lithuanian Union Within the Commonwealth, the Lithuanian ''raison d'état
inspired the Lithuanian nobility to maintain their own state offices, administration, army, treasury, and courts. The legal system of Lithuania, through the Statutes of Lithuania and the Lithuanian Tribunal, was also a marker of Lithuanian separateness from Poland. On 28 January 1588, Polish–Lithuanian Commonwealth monarch Sigismund III Vasa confirmed the Third Statute of Lithuania, prepared by the Lithuanian Vice-Chancellor Lew Sapieha, which stated that the Polish–Lithuanian Commonwealth is a federation of two countries – Crown of the Kingdom of Poland and the Grand Duchy of Lithuania where both countries have equal rights within it. Furthermore, a notable example of Lithuanian raison d'état'' was the
Union of Kėdainiai in 1655, guided by the Prince
Janusz Radziwiłł, when the Polish–Lithuanian union broke down and the brief
Swedish–Lithuanian union was created. Still, an enduring sense of Lithuanian distinctness did not stop the widespread cultural (but not yet political)
Polonization of the Lithuanian nobility. For example, among the
Reformed Lithuanian Unity, the liturgical language was Polish, but
Fatherland (
patria) referred to the Grand Duchy of Lithuania and their attempts to maintain separate rites were seen as Lithuanian separatism. However, some Polish historians claim that the existence of Lithuanian separateness is overstated. in Warsaw (pictured) the majority of deputies of the Grand Duchy of Lithuania opposed the Polish deputies aspirations to abolish the separateness of the Grand Duchy of Lithuania and this resulted in adoption of the
Reciprocal Guarantee of Two Nations On 3 May 1791, the
Great Sejm in Warsaw adopted the
Constitution of 3 May 1791, which transformed the Polish–Lithuanian Commonwealth (Republic of Two Nations) into an
unitary monarchy state called and in the Constitution the Grand Duchy of Lithuania was not mentioned as constituent part of the . The advocates of the draft of the Constitution in a hurry began the debate on the Constitution two days early, while many opposing deputies were away on
Easter recess, thus on 3 May 1791 the Sejm convened with only 182 members, about half its "dual" number. During the Great Sejm the majority of deputies of the Grand Duchy of Lithuania opposed the Polish deputies aspirations to abolish the separateness of the Grand Duchy of Lithuania and the majority of Lithuanian deputies supported the adoption of the Constituon on a compromise that more sovereignty and rights will be granted to the Grand Duchy of Lithuania in the unitary state. Consequently, later on 20 October 1791 the
Reciprocal Guarantee of Two Nations, an addendum to the Constitution, was adopted unanimously by the Great Sejm and was signed by monarch
Stanisław August Poniatowski which confirmed duality of the Republic of Two Nations. In November 1793, the
Grodno Sejm formally abolished the Constitution of 3 May 1791 and it was the last convening Sejm of the Polish–Lithuanian Commonwealth. In the
Kościuszko Uprising, controversy arose regarding the organization of the Lithuanian insurgents. The first insurgents in Lithuania in
Šiauliai, having acknowledged
Tadeusz Kościuszko, a self-declared Lithuanian, as Supreme Commander of the Nation on 16 April 1794, named
Antoni Chlewiński as the Commander of the insurgent forces in Lithuania. Then, the successful
insurgents in Vilnius formed the as Lithuania's sovereign government, with
Jakub Jasiński as commander-in-chief, on April 24. Kościuszko dissolved the Council on June 10 and created the Central Deputation, subordinate to the
Supreme National Council. This action weakened Lithuanian support for the uprising. == In 19th-century Lithuania ==